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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