Phenolphthalein

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.

Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink. When a base is added to the phenolphthalein, the molecule ⇌ ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed. This is predicted by Le Chatelier's principle.

Product Description:

Item: Phenolphthalein

CAS No.: 77-09-8

Purity: 99% min

Standard: USP

MF: C20H14O4

MOQ: 10grams

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SPECIFICATION CP2010/BP/USP/EP PACKING 25KG/DRUM CAS 77-09-8 Characteristics A white crystalline powder Melting Point 260℃~263℃ Identification A:Complies B:Positive Color of solution The solution is clear and not more intensely coloured than reference solution Y7 Sensitivity Complies Granulariry Complies Limit of fluoran Complies Related substances Less than 0.5% Heavy metals Not more than10 ppm Acidity or alkalinity Complies Chlorides Not more than 0.01% Sulphates Not more than 0.02% Loss on drying Not more than 0.5% Sulphated ash Not more than 0.1% Organic Volatile impurities Complies Assay 98.0%-101.0%(C20H14O4)

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