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CAS 77-09-8 Phenolphthalein
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CAS 77-09-8 Phenolphthalein

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Phenolphthalein  is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again.


Phenolphthalein is also a drug, can be used as a laxative, acting on the colon for the treatment of constipation.


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