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How is plaster of paris prepared ?...

How is plaster of paris prepared ?

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Plaster of parise is a hemihydrate of calcium sulphate `CaSO_(4^(*))1//2H_(2) O` . It is obtained by heating gypsum at 393 K
`underset("Gypsum")(2CaSO_(4^(*))2H_(2))O_((s))overset(Delta)tounderset("Plaster of paris")(2CaSO_(4^(*))H_(2)O)+3H_(2)O`
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