User talk:Karlhahn

Archived talk August-November 2006

Salinity control
Hi always, Karl. I definitely took your suggestion and refined the info on the ideal proportions of potassium to sodium. If you please, look at "Principles of Salinity control" at Salinity control. What I post is certainly neither original nor not original. Unless you can prove that what I write is original research, not conforming to a neutral point of view, and/or unverifiable, do not delete what I write. Mcampbell422

Lead
Hi, someone was vandalising while you were editing lead, I hope I did not demolish your edits while removing the vandalism. Nice work on lead, by the way! Keep up the good work! --Dirk Beetstra T C 20:43, 10 December 2006 (UTC)

Lead smelting
I expect that what you have done is an improvement (though not helped by vandalism). However there is a need for a rather more wide-ranging article on the metallurgical processes in producing lead and its derivatives. This may need to be a separate article. See for example reverberatory furnace. I do not think we have smelt mill or bolehill yet, but we seem to have cupellation - a desilvering process. These are historic processes (now obsolete). My expertise is in iron, rather than lead and I am not sure that I have the time to write the articles in question. Peterkingiron 10:21, 11 December 2006 (UTC)
 * The Lead Development Association website looks a suitably autorative source. I raised the query because historically smelting was in a cupola (reverberatory furnace).  I think ther eis probablky enough on lead smelting in the lead article, which is a general one concenred with it as a chemical eleemetn, but it may be useful to have a more detaild article on lead smelting.  Some one else has been working on a general one on smelting and the two lines of work need joining up.  There are also other metals that need similar attention (for example copper.   Peterkingiron 15:09, 5 February 2007 (UTC)

tag
Question for helper: Please see User:Karlhahn/Tide Prediction/sp98ref, which is a template, and the draft, User:Karlhahn/Tide Prediction for usage of the template. The purpose of the template is to provide a shortcut for referencing various pages of a certain book on the topic. The problem is that although using the template does produce the [2] indicator, but the expansion of the reference fails to show up in the &lt;references/&gt; section. What am I doing wrong?? Thanks for any help you can provide.
 * You can't have the ref-tag in a template, it does not transclude correctly. Limitation of the software.  --Dirk Beetstra T  C 20:34, 13 January 2007 (UTC)

Thank you for experimenting with the page usertalk: anonymous on Wikipedia. Your test worked, and it has been reverted or removed. Please use the sandbox for any other tests you may want to do. Take a look at What Vandalism Is not learn more about treating people like vandals who havent vandalized our encyclopedia. -- 24.63.142.101 19:05, 19 January 2007 (UTC)

No Problem
"my generation did some weird stuff there too back in 1970" :D hahahahha!

it wasnt so much a bad editing job... it was reverting the page to something that was pretty bad already. ive combined the new and old pages, so its better now. —The preceding unsigned comment was added by 24.63.142.101 (talk) 10:52, 20 January 2007 (UTC).

Testing new signature
Test: --Karl Hahn (T) (C) 02:24, 24 January 2007 (UTC)

Log
Hi Karlhahn, thanks for considering me for helping out to find out the log for Image:SurfaceTension.jpg. You may find out this here. Cheers, Shyam  ( T / C ) 14:59, 28 January 2007 (UTC)

lenntech.com
Hi, I saw you added a link to lenntech.com to the external links section of some articles. I reverted Chlorine, but saw that there are 13 more in article space. To me this looks like a commercial link, which woud not be allowed by WP:EL. Does that link really add information that cannot be incoporated into wikipedia, and which is not available from non-commercial sources? --Dirk Beetstra T C 21:07, 10 February 2007 (UTC)


 * I knew you were not spamming, I see your name regularly in my watchlist, and know you from many good edits. I know that there are reasons why one has to link to commercial sites, and that was why I was not mass removing them now, I wanted to discuss this with you.  In general, links should be kept to a minimum, and when things have to be linked, only official sites, etc.  In my interpretation of WP:EL, I start with the first sentences of WP:EL, which state that links can be added, but that that should only be done for pages from which the information can not be incorporated into the wikipedia .. which makes for me almost every external link superfluous, though I can come with examples where one cannot avoid linking externally to commercial sites.  The problem with commercial sites is, whenever there is one link, other people will start adding their links (because my/that site is also providing that information, so if there is one ..), hence a bit inviting spam.  Though I am not lenient to the 'someone has done it, so I can too', it is indeed better to avoid commercial links altogether and to try and find non-commercial sites first (and some in the wikiproject spam are even more direct in axing down external links sections).  Hope this explains a bit.  --Dirk Beetstra T  C 23:17, 10 February 2007 (UTC)


 * There is a simple and effective solution: since you use the site for writing of the articles, and the site contains reliable information, you could in this case use the site as a reference i.s.o. an external link. References are hardly ever spammed because that would be too obvious.  You used this site, not another one that another person might add.  Hope this helps.  --Dirk Beetstra T  C 23:53, 10 February 2007 (UTC)

citizendium
www.citizendium.org maybe you would enjoy editing here as well.

CHLORINE, First Aid
My contribution to this subject is based on personal observations; I have worked a lot with chlorine. Unfortunately I have no reference and I do not know, whether the procedure sugessted will provide only symptomatic relief or also has some therapeutic value. If you feel that my comments should be deleted, I will not be offended. Recent events in Iraq have prompted me to write; similar incidents may happen in the USA. The first aid suggested in the MSDS sheet ("move victim to fresh air") is not only self-evident, but may also be of little value to a victim trapped in a building surrounded by chlorine gas (I work in a lab within 500 meters of a chlorine plant). Because the chemicals I suggested ( ammonia and ethanol) are available in many households, it may be worthwhile to determine whether they are also effective in decontaminating air in a building. Comments are invited Walther Grot —The preceding unsigned comment was added by 151.197.54.195 (talk) 00:50, 24 February 2007 (UTC).

Re: Truman administration category
I've replied at the UCFD discussion. VegaDark 21:45, 15 March 2007 (UTC)

User box creator with template
I noticed you made a userbox here are two useful userbox creators you might be interested in
 * Userbox Creator with template - designed to easily generate Userboxes and has builtin template.
 * Userbox Creator with template has religious image database - designed to easily generate Religious Userboxes and has builtin template.

Java7837 20:10, 8 April 2007 (UTC)

when you choose to make a user box it provides instructions--Java7837 22:14, 8 April 2007 (UTC)

License tagging for Image:HiLoPressureAzeotrope.png
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With compliments...
--One Salient Oversight 13:59, 4 May 2007 (UTC)

Azeotrope
Not necesarily. I was trying to make it clear that the vapor phase is spatially separated from the VLE (vapor-liquid equilibrium) system before it was cooled. If you can word that better, more power to you, I just think it would be made explicitly clear it happens. —The preceding unsigned comment was added by 130.160.203.183 (talk) 02:33, 5 May 2007 (UTC).


 * It was a very good article, by the way. I passed thermo and separations and I still did not fully understand azeotropes until I read this article. —The preceding unsigned comment was added by 130.160.203.183 (talk) 02:35, 5 May 2007 (UTC).

Acetic acid data - thanks
Hi, I just wanted to thank you for all the additions at Acetic acid (data page). I believe that if we're going to get Wikipedia chemical compound pages to become a major resource we need to get these data pages crammed with data chemists can really use. We're already starting to see external resources such as ChemSpider linking to our compound pages, and we can expect to see a lot more (I've even discussed journal articles linking directly to our pages!) You've given us a great example to follow with the acetic acid work - thanks a lot for that! Walkerma 05:25, 7 May 2007 (UTC)

License tagging for Image:LogIospropanolVaporPressure.png
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Calculation mistakes on CaCO3 page?
I'm interested to know how you calculated your table of Ca2+ solubility as a function of P(CO2) in the calcium carbonate page. The table makes no sense at all to me - for example, as partial pressure of CO2 approaches 0, the solution gets more and more basic, which is obviously wrong and indicates a complete disregard of the autodissociation of water. In the section explaining the calculations behind the table, you seem very competent - which makes me all the more confused about the table. I'm currently creating an excel spreadsheet to recalculate the correct values - tell me if i'm forgetting something. —The preceding unsigned comment was added by Tantalite (talk • contribs) 00:34, 10 May 2007 (UTC).

Calcium carbonate
That the equilibrium results are affected by the presence of other ions is not in question. So your annotation is appropriate. But your phrasing makes it sound as if the presence of other ions removes the requirement for electrical neutrality. Of course the solution must be electrically neutral no matter what its ionic content. The presence of other ions simply means that they must be included in the neutrality equation. I haven't thought of a suitable reword for your annotation yet, but I'm posting this to you so that perhaps you will think of it and make the corresponding edit. Karl Hahn (T) (C) 21:50, 12 May 2007 (UTC)


 * Of course the electrical neutrality is not in question. In the case where the origin ions content of the solvent water is such that the pH is not neutral (for example a HCl solution), the anion and cation contributions do not cancel in the neutrality equation so that the equation is modified (presence of the Cl- concentration in the above example). The result is the well known property of the strong dependence of CaCO3 solubility with the acid/alkaline character of the solvent, or stated another way of the maximum Ca++ concentration in water as a function of pH (I am confronted with this problem in my swimming pool just now). I just wanted to stress that the calculation presented in the present version of the paragraph does not take account of this important feature as it only treats the problem of the solubility of CaC03 in pure water (in which case the pH is not a free parameter).


 * I will try to reformulate the phrasing.


 * Thank you for your interest and for the considerable improvement you made to this section with respect to my first version. I must confess that I was very surprised by the interest raised by this problem. Wonderful Wikipedia ! Johner 14:19, 13 May 2007 (UTC)

chill pill
Seriously dude, you need to take a chill pill and take it easy or you're gonna have a heart attack or something. —The preceding unsigned comment was added by 130.160.33.116 (talk) 15:18, 14 May 2007 (UTC).

Solubility
Hey Karl,

My first impression of solubility as a function of temperature is incorrect. For most solutes that release energy upon dissolution, solubility increases with rising temperature regardless of Le Chatelier's Principle. We also have to consider Gibbs Free Energy and the large entropy increase when a solid is dissolved.

Occurrence maps
They were all based on this map which doesn't seem to be in the public domain. You're more than welcome to re-create them based on a free source (world maps under a free license can be found here. Yonatan talk 02:00, 25 May 2007 (UTC)

Volatile compound IR spectra
Hi Karl,

Sorry I haven't got to this yet, I got sidetracked onto other things, but I'll definitely have a go over the next few days. Walkerma 16:03, 8 June 2007 (UTC)

Harry-s-truman-58-766-09.jpg
Commons user Vints put speedy on this because Truman library says "Restrictions:Undetermined", which means the copyright status is unknown. . They wrote in a mail to him: "Photographs that are indicated to be of undetermined origin are ones for which we have no information regarding photographer or ownership. We will provide the photograph to you, but you would use it at your own risk. We can only tell you that we don't have any copyright information on the picture."

Since the copyright status is unclear, we can't say it is free image. For this reason it was deleted as incompatible with Commons License Policy. --Zirland 17:08, 11 June 2007 (UTC)

Image:NewHavenCtOutlineMap.png
Thank you for uploading images/media to Wikipedia! There is however another Wikimedia foundation project called Wikimedia Commons, a central media repository for all free media. In the future, please consider creating an account and uploading media there instead. That way, all the other language Wikipedias can use them too, as well as our many sister projects. This will also allow our visitors to search for, view and use our media in one central location. If you wish to move previous uploads to Commons, see Moving images to the Commons. Please note that non-free content, such as images claimed as fair use, cannot be uploaded to the Wikimedia Commons. Help us spread the word about Commons by informing other users, and please continue uploading!

BTW The mediawiki software in use on commons and enwiki can handle SVG directly IIRC :) Sfan00 IMG 20:34, 4 August 2007 (UTC)


 * I'm no SVG guru, but I am sure some of the people on commons would be able to advise :) Sfan00 IMG 14:09, 5 August 2007 (UTC)


 * I've asked someone from commons(User:Sundance_Raphael) to look into the SVG side of this. :) Sfan00 IMG 14:26, 5 August 2007 (UTC)


 * You can definitely upload SVGs to Commons. They are all over the place in Commons, in fact. Go for it. —  SMcCandlish  &#91;talk&#93; &#91;cont&#93;  ‹(-¿-)› 09:57, 7 January 2008 (UTC)

Sheepish grin
Karlhahn, you are correct re Dorothy Dandridge, that our material was copied by the cited website and not the other way around. I have removed the tag, and the entry on Wikipedia:Copyright problems. Cheers. Moriori 23:10, 6 September 2007 (UTC)

Please consider relocation of your Template:Separation processes in some cases.
Your navigation Template:Separation processes is very well done. However, when you add it at the top of an article which already has an image or a photo at that point, it really "messes up" the appearance of the article because the articles lead-in text is forced to squeeze into a the very narrow residual space or,in some cases, it causes large empty white spaces. For example, see the Distillation and the Dissolved air flotation articles.

In those cases, would you kindly consider relocating the template at the bottom of the article? That is fairly often done with other similar templates. I will watch for your response here on your Talk page. Regards, - mbeychok 03:34, 8 September 2007 (UTC)


 * Done. Karl Hahn (T) (C) 04:15, 8 September 2007 (UTC)


 * Thanks very much. I only wish that all Wikipedians were as cooperative as you have been. Best regards, - mbeychok 05:13, 8 September 2007 (UTC)

surface tension
Wow! This article is already a huge improvement! Very close to GA status right now! I will agree with you on the thermodynamics section; it's interesting (my background is in computational chemistry, so thermodynamics is more interesting to me, personally), but it's not really essential to the basic understanding of the article, so it's fine where it is. I like what you've done with the photos and images; the gallery is good at the end, plus, it includes some brief text for each example as well.

A good, final copyedit couldn't hurt. Double-check some of the section headers - I see a couple of randomly used 3rd and 4th level subsection headers used, and sometimes looks a bit weird with different-sized text. I did remove two 'definition' section headers, as they are really introductions to their respect sections, and unnecessary (I think we can figure out that the text is defining the concept). There are quite a few words that are in bold, which probably isn't really necessary - like the bold words at the beginning of each bullet point under 'effects' - the bullet points should draw enough attention to each as-is. It's also unnecessary to both bold & link something (soap bubbles and emulsions - the links are enough there). There's a couple other bolded words to look at as well, later on. Also, the italics in the 'measurement' section seem unnecessary as well -- it's hardly noticeable, so I'm not sure what that's been done anyway?

'Methods of measurement', as written, is really just listing the techniques and a brief description. It could use a bit more of an introduction. Which one of these nine methods is most commonly used in the laboratory?

The lead could probably still be expanded a little better. While it's got a very basic definition, it's still not really covering the contents of the article. A good lead section should summarize the contents of the article well, and be able to stand on its own, in a sense. Two to four good paragraphs is a good-sized lead. The current lead seems kind of boring - it just provides a one sentence definition, and a couple of examples, and it doesn't really spark my interest to read more. Maybe it could help to review WP:LEAD for tips? Dr. Cash 02:59, 11 September 2007 (UTC)

Replied at my talk page to the issues you raised there on this topic. —  SMcCandlish  &#91;talk&#93; &#91;cont&#93; ‹(-¿-)› 09:53, 7 January 2008 (UTC)

More surface tension
I see you fixed got some references!! Thank you for your efforts on the article, you're doing great —Preceding unsigned comment added by Knights who say ni (talk • contribs) 12:18, 11 September 2007 (UTC)

Iodine
Unfortunately the said edit was made on a library computer. Therefore it is highly unlikely that the person who made the edit will be notified. --24.190.141.99 00:04, 14 September 2007 (UTC)

Ethanol
Hi Karl

Just a note to thank you for your contributions with regard to fixing cn and other referencing issues. --Rifleman 82 16:50, 17 September 2007 (UTC)

pourbaix diagram
The Pourbaix diagram is a well known method of displaying which chemical species is the most common at a given pH and redox potential. It is normal to express the redox potential in volts relative to the SHE. It has become a de facto standard way of displaying many details of how a system will behave. If you want a reference for the software which generates the diagrams then see www.kemi.kth.se/medusa.

I think that you may have underestimated the reader, I think that a reference book which lacks material which you do not at first understand will be a bland and irksome book. I think that we should include some material which does expand the chemical thinking of readers who are looking at a chemical article. Perhapes you should go and talk with user:stone about the idea of using such diagrams.

Also the diagrams in the health section are important as they explain why one should not put fruit juice in a lead container. It was the use of lead pots to hold wine which poisoned the romans (along with their habit of using sugar of lead in wine).

Much of what I wrote about lead has been known for so many years that it is hard to find a reference, I think that the original reference has been lost in time. For instance all chemists know that lead sulphate, lead(II) chloride and lead sulphide are very insoluble. I think that the diagrams should go back in, I am currently in the process of making diagrams for every chemical element.Cadmium 18:51, 24 September 2007 (UTC)

Ethanol
There is a semi automatic peer review posted on the talk page of Ethanol to provide direction in regards to improvements to help you achieve GA status. I popped the article into MS word, corrected spelling, and no grammar errors were found in this spellcheck program. Good luck with your endeavours. SriMesh | talk  02:04, 8 October 2007 (UTC)
 * As well, Tim Vickers has left a GAN rating to peruse for changes and improvements as well. Good luck and Kind Regards.  SriMesh |  talk  15:16, 8 October 2007 (UTC)

Hebrew calendar
Let me guess, you picked up my 300000000 character deletion on your targeting screen and clicked revert and then realized I was ok and fixed it. Used to happen to me too when I was an active RC patroller. No harm done :) Keep fighting the good fight.  Kaisershatner 14:39, 30 October 2007 (UTC)
 * Hey, thanks for the note. I had no idea you were the author/part author of that section, I figured you were simply an RC patroller noticing the large deletion.  NB I transwikied it to wikibooks, so it isn't lost or destroyed.  Someone else had tagged it as a "how to" and I think that was more or less right.  I am still working on edits to the body regarding calculations, as you note it needs work; what I'm looking for next is when and where they were developed.  (The article refers to Maimonides but I haven't read him on this yet and will take a look.  Also google books had some interesting text.)  Anyway, help is always welcome.  Best, Kaisershatner 20:17, 30 October 2007 (UTC)

CR 14 page
I wasn't vandalizing the CR 14 page, what I wrote is pretty much dead on, I recently reverted to my version adding citations in the process to back up my claims, so it was wrong to accuse me of vandalism. Please don't wrongfully point blame.


 * I'd have to defend Anonymous User:71.183.41.214's actions. Although everything I've seen indicates that Suffolk CR 14 still goes as far south as Long Island Motor Parkway, I'd like to see some concrete evidence to the contrary before you brand this user as a vandal. DanTD 00:57, 14 November 2007 (UTC)

http://en.wikipedia.org/w/index.php?title=Taoism&action=history
I don't get what you did? what is using popups? —Preceding unsigned comment added by 96.224.101.132 (talk) 23:31, 15 November 2007 (UTC)

Adding Refferences
Your suggestion is well noted.Plasmic Physics (talk) 08:20, 10 December 2007 (UTC) I attempted to follow you example to correct beryllium, but my refferences does not link. What did I do wrong?--Plasmic Physics (talk) 08:52, 10 December 2007 (UTC)

Ethylene glycol
Hi there

Thanks for catching my mistake. Got confused, editing both this and 2-butoxyethanol concurrently. Sorry for the trouble. --Rifleman 82 (talk) 19:56, 31 December 2007 (UTC)

Re: Ethanol
I replied on my own talk page. I will revert my edit because there is evidence both ways. Shalom (Hello • Peace) 17:04, 12 February 2008 (UTC)

By the way...
You say on your userpage that you would have put a space in your username if you knew it was possible...you can change your username if you want to... :) Shalom (Hello • Peace) 17:06, 12 February 2008 (UTC)

User:Karlhahn/DRAFTflotation
I've deleted User:Karlhahn/DRAFTflotation as you requested. Happy editing! &mdash; E  talk 22:10, 14 February 2008 (UTC)

Image:SurfTensionContactAngle.gif listed for deletion
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Image:SurfTensionEdgeOfPool.gif listed for deletion
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Speedy deletion of Image:SurfTensionContactAngle.gif
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azeotropic mixtures at room temperature
Karl,

I hope you still monitor this page. I am interested in knowing how an azeotropic mixture will behave when it is no where near the azeotropic boiling point. For instance, if I use an azeotropic starting composition for ethanol: water (95:5), but I just leave it out in a petri dish in ambient conditions of 21C and 1 atm, when I come back in an hour and recheck the composition, will it still be 95% ethanol? My reason for asking is that in my field of solvent cleaning, we often use starting mixtures that are deamed "safe" for certain coatings, but that actually contain pretty aggressive components that are mixed with more benign components to tone them down. We worry about room temperature evaporation leading to a "last drop" that might be very high in the aggresive component. To counteract this, people have recommended using only azeotropic combinations of solvents. However, this is far from a fractional distillation experiment, so will they still maintain constant composition?

Thanks, Greg —Preceding unsigned comment added by 71.243.185.171 (talk) 03:45, 28 February 2008 (UTC)


 * Reread the sections of the article on Raoult's Law and pressure-swing distillation. Keep in mind that allowing your ethanol solution to evaporate at room temperature is no different than distilling at reduced pressure. That is, if you reduce the pressure to the point where the solution boils at room temperature and distill, the vapor arising will have the same composition as the vapor that arises from evaporating the same solution at room temperature. The fact that distilling under reduced pressure is not an effective way of breaking the water/ethanol azeotrope would indicate that evaporating that same azeotrope at room temperature would have little measurable effect on the composition. Other azeotropic mixtures might behave differently. You can't know the evaporation behavior of mixture without obtaining expanded equilibrium data for the mixture in question at room temperature. Karl Hahn (T) (C) 17:12, 28 February 2008 (UTC)

Calculus and Fluoride
Hey there

I just found out that you're the author of Karl's Calculus Tutor when I saw your user page! I've found it of great help, and I really appreciate your resource!

Actually the main reason I'm messaging you is that I saw your edit at sodium fluoride, and I think you might be interested in taking a look at Fluoride and the discussion at Talk:Fluoride. --Rifleman 82 (talk) 17:51, 29 February 2008 (UTC)

Hello Karl Hahn. I do believe that you told me that my calculations on my Nitrogen page were incorrect. I take offense to that to the highest degree. Try and prove that nitrogen is real. Try to prove anything is real Karl Hahn. Try to prove your real. Go ahead Karl Hahn, prove to me that anything is real.

Prove
Hello Karl Hahn. I do believe that you told me that my calculations on my Nitrogen page were incorrect. I take offense to that to the highest degree. Try and prove that nitrogen is real. Try to prove anything is real Karl Hahn. Try to prove your real. Go ahead Karl Hahn, prove to me that anything is real.

Feedback rquest
Hello, I am writing my first article and I am hoping you can give me feedback on the history section. I noticed that you have made many contributions to chemistry pages and have an understanding of chemistry. My article is about mesoporous silica. Apheontai (talk)

Thank you very much for your input. I have put the begining information into an info-box and hope to improve the lead soon. Do you know how to move the info box to the right of the page? Apheontai (talk) —Preceding comment was added at 05:26, 14 March 2008 (UTC)

Thank you!Apheontai (talk) —Preceding comment was added at 16:05, 28 March 2008 (UTC)

Thank you for fixing the reference style on the mesoporous silica article. I did not know how to format the references appropriatly, but I will be sure to do that in the future. Thank you!Apheontai (talk) 16:43, 8 April 2008 (UTC)

Orphaned non-free media (Image:MadisonCtTownSeal.jpg)
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 * Best bet is to flag the Bot Op. He'll know what caused the software to react to his bot and who to contact if it wasn't he bot.  MBisanz  talk 19:39, 25 March 2008 (UTC)

Meetup
Meetup/Tampa -- You're invited! Hires an editor (talk) 13:01, 2 August 2008 (UTC)

Methanol Data Page - Properties of aqueous methanol solutions
Karl-

I am trying to locate the data contained in the table: Properties of aqueous methanol solutions, located on the Methanol Data Page.

I have the 89th Edition of the CRC and the 14th Edition of Lange's Handbook of Chemistry here. The pages listed in the references section do not correspond to the sections of the reference books. Can you provide the source for this data? I would like to look it up in the texts. Thank you very much.

139.62.223.145 (talk) 17:55, 30 January 2009 (UTC)

Paul, paul.sander@unf.edu


 * In CRC 44th, it's page 2137 "Specific Gravity of Mixtures of Methyl Alcohol and Water". In Lange's 10th it's page 1193 through 1197. In your editions, look in the index under "methyl alcohol" for specific gravity tables. Karl Hahn (T) (C) 21:55, 31 January 2009 (UTC)

Orphaned non-free media (File:SouthburyCtTownSeal.png)
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Copycat
User:Animus999 appears to be claiming that he is you. Or maybe he just likes your user page and wants his to look like yours. In either case, I just thought you should know. 71.185.178.156 (talk) 00:53, 5 April 2009 (UTC)

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NowCommons: File:LogCO2VaporPressure.png
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Number of reported azeotropic mixtures in Azeotrope article
Karl, you reentered the paragraph "More than 18,000 azeotropic mixtures have been documented" and cite Hilmen's thesis. I had removed this statement some months ago because Hilmen did not write this.

You probably refer to the statement "This azeotropic data book reports to comprise more than 18 800 systems involving approximately 1 700 compounds, in which approximately 47 % of the systems show azeotropic behavior".

Hilmen cites the book of Gmehling et al. "Azeotropic Data". This book indeed contains 18800 mixtures but only 47 percent are azeotropic mixtures as Hilmen also wrote. The rest is known to be zeotropic. This book effectively contains approx. 9000 azeotropic mixtures. By the way, the Azeotropic Data book has been created from the Dortmund Data Bank and they published a page with their current statistics at http://ddbst.de/new/AZDDDB.htm where 9752 azeotropic mixtures are mentioned (status of june this year). --WilfriedC (talk) 21:10, 10 October 2009 (UTC)

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Droplet shape formula
LS

I read your article on surface tension, I really liked it. I was just searcing for something like this. But can you help me on the formule for the droplet shape if the contact angle is not 108 degrees?

regards jeroen —Preceding unsigned comment added by 194.105.120.80 (talk) 13:38, 22 June 2010 (UTC)

Nomination for deletion of Template:UserContribs
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solubility
Discussion continues on my talk page. Petergans (talk) 08:05, 12 December 2011 (UTC)

Non-Wikipedia Question Regarding Pressurized CO2
Hello Karl,

I hope it is okay for me to bug you on this. I saw that you edited the technical language in Carbon dioxide data, so I thought you might have the knowledge to help me in a project I am working on. I am pressurizing spherical bottles, 75 - 224 cubic inches in volume, with CO2 (and other gasses, but that is for the next step in my process) at pressures up to ~500 psig at ~25C. I am then cooling the bottles down to -60C. My current task is to predict expected bottle pressure as a function of starting pressure and current temperature. I think I will need to predict the amount of CO2 that is liquid and the amount that is gas at each test point in order to do this, but I could be wrong. Do you have any advice, or could you point me to useful literature which might help me create my model? Many thanks in advanced. Sincerely, Ebikeguy (talk) 19:59, 12 September 2012 (UTC)

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ArbCom elections are now open!
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Orphaned non-free image File:CheshireCtTownSeal.png
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Sir-

The figure you provided for the Wikipedia entry on 'Raoult's Law' entry is incorrect. Raoult's law states that the activity must equal the mole fraction as it approaches unity, and the slope must asymptotically approach X=a. Your image doesn't show asymptotic approach to X=a at high concentrations.

Bill — Preceding unsigned comment added by 169.237.39.57 (talk) 13:48, 25 April 2016 (UTC)

Sir-

The image you included in the discussion of Raoult's Law, showing deviations, is incorrect--I have no idea from where it comes. Real solutions must express both Henry's law at dilute concentrations, as does the figure, but they must asymptotically approach Raoult's law at high concentrations, which this image does not.

The image in the Azeotrope Wikipedia entry of 2-proponol and water is better. It shows both a finite slope at dilute concentrations (Henry's Law) and asymptotic approach to Raoult's Law at high concentrations.

I suggest it be swapped.

Bill Casey — Preceding unsigned comment added by 169.237.39.57 (talk) 17:46, 15 November 2016 (UTC)

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