why is calcium sulphate hemihydrate called plaster of paris ?
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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 '.
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gypsum is CaSO4.2H2O
when gypsum loses its water of crystallization Plaster of Paris is formed.Thus it is called calcium sulphate hemihydrate.
Explanation:
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