Phenolphthalein is a member of phenols and is functionally related to a 2-benzofuran-1(3H)-one. It is a chemical compound commonly used as a pH indicator in various applications. It is colorless in acidic solutions (below pH 8.3) and turns pink or magenta in alkaline/basic solutions (above pH 10). This characteristic color change makes it valuable in determining the acidity or alkalinity (pH) of a solution, particularly in laboratory settings, educational demonstrations, and various industrial processes.
|Name of Product||Phenolphthalein|
|Synonyms||Phthalimetten; Euchessina; Phthalin; Espotabs; Phenolax; Purgophen; Koprol; Laxogen; Fenolftaleina; fenolftaleína|
|Molecular Weight||318.3 g/mol|
|1||Appearance (Form)||Solid Powder|
|2||Appearance (Color)||White to Off-white|
|3||pH range (8.2 - 10.0)||Colorless to Red-violet|
|4||Absorption maxima (buffer pH 9.8)||551 - 554 nm|
|5||Sulphated Ash||NMT 0.05%|
|6||Chloride (Cl)||NMT 0.01%|
|7||Sulphate (SO4)||NMT 0.01%|
|8||Loss on drying (at 110°C)||NMT 1%|
Q. What color is phenolphthalein when the solution is acidic ?
Phenolphthalein is colorless in acidic solutions.
Q. What is the pKa of phenolphthalein?
Phenolphthalein has a pKa value of 9.7.
Q. Is phenolphthalein an acid?
Phenolphthalein is a weak acid.
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