User talk:Dreamer hillol

. "what is color change interval of indicator as ph" An Indicator does not change color from pure acid to pure alkaline at specific hydrogen ion concentration, but rather, color change occurs over a range of hydrogen ion concentrations. This range is termed the color change interval. It takes place with a small interval of pH about 2 units. It is expressed as a pH range. The position of color change interval in the ph scale varies with different indicators. For most acid-base titration it is possible to select an indicator which exhibits a distinct color change at a ph close to the equivalence ph.

khalid md. bahauddin(hillol) Env. Science, Jahangirnager Varsity, Dhaka, Bangladesh (dreamer_hillol@yahoo.com) ref: Vogel's textbook of Quantitative chemical analysis by J MENDHAM, RC DENNEY, JD BARNES, MJK THOMAS