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?
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.