Phenolphthalein/3,3-Bis(4-hydroxyphenyl)-2-benzofuran-1(3H)-one/ 3,3-Bis(4-hydroxyphenyl)isobenzofuran-1(3H)-one/ C20H14O4

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Description

It is often used as an indicator in acid–base titrations, turns colorless in acidic solutions and pink in basic solutions.

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