Question

what is meant by water of crystalli ation​

Answer 1

The water molecules which forms part of a crystal are called water of crystalisation.

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Answer 2

Crystals of some compounds seem to be dry but actually contain some water molecules attached to them. Water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Such salt is called a hydrated salt.

Ex. CuSO4.5H2O