Question

Why is calcium hemihydrate called plaster of Paris?

Answer 1

Because it has only 1/2 water of crystallization.

Answer 2

Hey Because, Plaster of Paris (POP) is obtained by heating calcium sulphate hemi hydrate, also referred as gypsum for about 140-180 degree Celsius. The name Plaster of Paris (POP) is derived as the calcium sulphate hemi hydrates are found in large amount deposited in the Montmartre hill in Paris.

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