What is phenolphthalein
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A colourless crystalline solid (pink in alkaline solution) used as an acid–base indicator and medicinally as a laxative.
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Phenolphthalein is a chemical compound with the formula C₂₀H₁₄O₄ and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
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