Answer:
Water of crystallization is a fixed number of
water molecules present in one formula unit of a salt. One formula unit of
copper sulphate contains five water molecules (5H2O). The water
molecules which form part of the structure of a crystal are called water of crystallization.
When hydrated salts are heated strongly, they lose their water of crystallization.
On strong heating, blue copper sulphate
crystals turn white (due to the loss of water of crystallization).
Anhydrous copper sulphate turns
blue on adding water.
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