Talk:Phthalic acid

pH
pH data should be included?
 * pKa data should be included when we can find some... Physchim62 (talk) 10:03, 9 December 2005 (UTC)

Where did the current two pKa values come from? I have 2.95 and 5.41 (from Analytical Chemistry, 7th ed., by Skoog et. al.) --Motrax 19:37, 5 November 2006 (UTC)

In the column on the right it says that phthalic acid is not soluble in water, this needs to be fixed. It is soluble in water .54 g/100ml dissolves at 14 degrees Celsius and 18 g/100ml dissolves at 99 degrees Celsius. —Preceding unsigned comment added by 129.120.193.116 (talk) 16:27, 29 March 2011 (UTC)

BP
The BP is in the text but not the column on the right. If somone could add it.
 * The boiling point in the text was for phthalic anhydride, not phthalic acid: phthalic acid decomposes before it even melts, let alone boils. I have removed the data as it was obviously causing confusion, and can in any case be found in our article on the anhydride. Physchim62 (talk) 10:03, 9 December 2005 (UTC)

Dimethyl phthalate
Why is Dimethyl phthalate redirected to this page? —Preceding unsigned comment added by Christian75 (talk • contribs) 01:14, 28 October 2007 (UTC)


 * I suppose because there is no article on methyl phthalate yet, but there were some links pointing to it. With the redirect, readers can at least deduce its structure from that of phthalic acid (assuming a very basic knowledge of organic nomenclature). If you want to write an article on methyl phthalate, you are welcome to replace the redirect. --Itub 09:12, 29 October 2007 (UTC)

I agree that there should be a page for dimethyl phthalate. After all, there's already a page for dimethyl terephthalate. I would do it, but I lack the knowledge as well as the motivation to do so. Deepfryer99 (talk) 19:13, 31 March 2008 (UTC)

Etymology
This addition was reverted, and for good reason, it seems.

The online OED gives the etymology as a shortening of naphthalic, from naphthalene, itself derived from naphtha + -ine (later swapped to -ene to better reflect the structure of the molecule). Naphtha is from the Hellenistic Greek νάφθα via classical Latin, ultimately probably of Oriental origin.

The word added and removed today appears to be modern Greek, c.f. Φθαλικές ενώσεις = phthalate and (I think) φθαλικό οξύ = phthalic acid.

Ben (talk)

Melting point
I happened to notice that says in the infobox, the melting point in a sealed tube is given at 167 degrees Celsius. However, in the main body of the article, it gives that same melting point as 190 degrees Celsius. Which is it? --128.193.15.52 (talk) 20:31, 28 May 2011 (UTC)
 * Well that's a good point. Aldrich chemical catalogue lists the mp as 	210-211 C with decomposition (to the anhydride?).  Ullmann's Chemical Encyclopedia indicate 191 C in a sealed tube.  A randomly selected MSDS gave 200 C. JTBaker's MSDS says "230C (446F) Forms anhydride and water" ([]).  So that is a 40C range, a problem.--Smokefoot (talk) 21:05, 28 May 2011 (UTC)
 * I wonder if it would be worthwhile to include multiple melting points, each with its reference, in the chembox? Just to indicate that there is a broad range of reported data. -- Ed (Edgar181) 21:58, 28 May 2011 (UTC)
 * SciFinder lists a range from 70+ to 200+ &deg;C. CRC reports 230 &deg;C (dec.). --Rifleman 82 (talk) 04:01, 1 June 2011 (UTC)

Pronunciation
Would it be a good idea to have an IPA pronunciation of phthalic? Does anyone know how to pronounce it? I'm having trouble finding one answer. Saltedcoffii (talk) 01:08, 1 April 2022 (UTC)