Question

What is ‘Plaster of Paris’ chemically? How is it obtained from gypsum? Write the condition and chemical equation involved in its manufacture.

Answer 1

Plaster of Paris when mixed with water sets quickly into hard mass known as gypsum which is a raw material in manufacturing cement 2CaSo4 + 3H2O gives rise to 2 CaSo4.2H2O+Heat

Answer 2

Chemical formula : CaSO4.1/2H2O

CaSO4.2H2O ----> CaSO4.1/2H2O + 1 1/2H2O

CONDITION IS HEAT

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