writ the preparation of calcium sulphate hemihydrate
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It is a hemihydrate of calcium sulphate. It is obtained when gypsum, CaSO4·2H2O, is heated to 393 K. Above 393 K, no water of crystallisation is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as 'dead burnt plaster
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on heating gypsum at 373k loses water molecules and turns into calcium suphate hemihydrate.
Reaction-caso4.2H2o----->caso4.1/2h2o+1.1/2h20
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