why is calcium sulphate hemihydrate called as plaster of paris?

Asked by sejupandey | 29th Jul, 2008, 12:22: AM

Expert Answer:

A large gypsum deposit at Montmartre in Paris is the source of the name.

Plaster of Paris is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4·0.5H2O. It is created by heating gypsum to about 150 °C.

2 CaSO4·2H2O → 2 CaSO4·0.5H2O + 3 H2O (released as steam).

Answered by  | 29th Jul, 2008, 06:11: PM

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