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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.
Plaster of Paris is called calcium sulphate hemihydrate. Its formula is CaSO4.1/2H2O.
Plaster of Paris is prepared by heating gypsum to a temperature at 373K and it loses 3/4th of its water of crystallisation and forms Plaster of Paris
$CaSO_4.2H_2O \rightarrow CaSO_4.1/2H_2O + 1 1/2 H_2O$
When plaster of paris is mixed with water, it forms gypsum (common name). Its chemical name is calcium sulphate dehydrate.
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