What happens when :
a) gypsum is heated at 373K?
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Gypsum is a 'calcium salt + water'. When it is heated at 373K it losses its water of crystallization and becomes 'calcium sulphate dihydrate' to 'calcium sulphate'. Gypsum is then converted into 'Plaster of Paris'.
CaSO4.2H2O -------> CaSO4 + H2O
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