What does water of crystallisation indicate? Give examples. - Vidyadip

Question

What does water of crystallisation indicate? Give examples.

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Answer

Water of crystallisation indicates the fixed number of water molecules present in one formula unit of a salt.
For example,
$ \mathrm{CuSO}_4 .5 \mathrm{H}_2 \mathrm{O}, \mathrm{CaSO}_4 .2 \mathrm{H}_2 \mathrm{O} $
$ \mathrm{FeSO}_4 .7 \mathrm{H}_2 \mathrm{O} \text { and } \mathrm{Na}_2 \mathrm{CO}_3 .10 \mathrm{H}_2 \mathrm{O}$

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