Question

Why CaSo4.1/2H2o is called as plaster of Paris

Answer 1

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.

Answer 2

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Plaster Of Paris (POP) :

* At careful heating of gypsum (CaSO₄ 2H₂O) at 373 K it loses water molecules partially to become calcium sulphate hemi hydrate (CaSO₄ .1/2 H₂O)

* this is called Plaster of Paris, the substance which doctors use as plaster for supporting fractured bones in the right position. It is used for making toys,,

* it is written in this form because two formula units of CaSO₄ share one molecule of water

* 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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