Question

Why is calcium sulphate hemihydrate called Plaster of Paris ??

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Answer 1

Answer:

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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Answer 2

Answer:

Plaster of Paris stands for calcium sulphate hemihydrate, which is obtained by heating the mineral, gyspum. ... Paris then had rich deposits of gyspum, which was heated in large quantities to manufacture plaster and make it strong enough to withstand weight of massive buildings and hence the name, 'Plaster of Paris '.