Question

Define phenolphthalein?​

Answer 1

Explanation:

a colourless crystalline solid (pink in alkaline solution) used as an acid–base indicator and medicinally as a laxative

Answer 2

$\huge\underline\mathfrak\color{blue}Answer$

Phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution's pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.