Phenolphthalein, an organic compound with the chemical formula C20H14O4, is a weak acid which can be used as an indicator for acid-base titrations. In acidic solutions, the compound is colourless. It is pinkish in simple solutions (with the transition occurring around pH 9).
1.672 ; MDL, MFCD00005913 ;
(98% to 99%
Phenolphthalein is often used as an indicator in acidbase titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
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Description. Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH