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Question

Calcium Sulphate Hemihydrate is also known as _______.


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Solution

  1. Calcium Sulphate Hemihydrate CaSO4.12H2O also known as plaster of Paris is a neutral salt formed by heating the gypsum CaSO.2H2Oat 373K.
  2. The heating is required to remove the water of crystallization from the gypsum. It has the property to absorb 3/2 of water of crystallization when exposed to air and converting into a hard mass.

CaSO.2H2O(aq)373KCaSO4.12H2O(aq)+32H2O(l)GypsumPlasterofparis

Hence, Calcium Sulphate Hemihydrate is also known as Plaster of Paris (CaSO4.12H2O)


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