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What is plaster of paris? How is it obtained?

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Plaster of paris is a hemihydrate of calcium sulphate (CaSO4 . 1/2 H2O). Plaster of paris is obtained by heating gypsum to 393K 

2 (CaSO4.2H2O)→ 2 (CaSO4). H2O + 3H2O.

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