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What is the chemical formula for Plaster...

What is the chemical formula for Plaster of Paris ? How is it prepared ? State the common and the chemical names of the compound formed when Plaster of Paris is mixed with water.

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`CaSO_4. 1/2 H_2O `
Plaster of Paris is prepared by heating gypsum to a temperature of 393 K .
`underset("Gypsum")(CaSO_4. 2H_2O) overset(393K)to underset("Calcium sulphate hemihydrate")(CaSO_4. 1/2 H_2O + 3/2 H_2O)`.
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