What is gypsum? What happens when gypsum is heated to 100°C (373 K)?
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Solution
Gypsum is calcium sulphate dihydrate (CaSO4.2H2O). When gypsum is heated to a temperature of 100⁰C (373K), it loses three-fourths of its water of crystallisation and forms plaster of Paris (CaSO4.1/2H2O).
Concept: Chemicals from Common Salt (Uses of Salt) - Preparation and Uses of Plaster of Paris
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