what is phenolphthalein.for class-7th
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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.
- Chemical formula: C20H14O4
- Melting point: 258–263 °C (496–505 °F; 531–536 K)
- Density: 1.277 g/cm3 (32 °C (90 °F))
- Appearance: White powder
Explanation:
Phenolphthalein is a weak acid and is colorless in solution although its ion is pink. ... Adding hydroxide ions (OH-, as found in bases) will change the phenolphthalein into its ion and turn the solution pink.
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