Q. 234.1( 11 Votes )

What is meant by water of crystallisation? Name four such salts which contain water of crystallisation in them. Why P.O.P. is written as CaSO4.1/2H2O?

Answer :

Water of crystallization is the fixed number of water molecules present in one formula unit of a substance

Four salts which contain water of crystallization are – copper sulphate, gypsum, Plaster of Paris, washing soda.

P.O.P. is written as CaSO4.1/2H2O because two formula unit of CaSO4 shares one molecule of water.

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