Define water of crystallisation. Give the chemical formula for two compounds as examples. How can it be proved that the water of crystallisation makes a difference in the state and colour of the compounds?

Define water of crystallisation. Give the chemical formula for two com

1.	Define water of crystallisation. Give the chemical formula for two compounds as examples. How can it be proved that the water of crystallisation makes a difference in the state and colour of the compounds?
Answer» Solution :• Water of crystallisation is the fixed NUMBER of water molecules present in one formula unit of a salt. • `CuSO_(4).5H_(2)O` `FeSO_(4).7H_(2)O` • Take one gram of powder COPPER sulphate crystals `(CuSO_(4).5 H_(2)O)` which are BLUE in colour in a dry China dish. It losses water molecules and a white powder `(CuSO_(4))` is obtained. Cool and ADD a few drops of water to the white powder. Blue colour is restored because of the formation of copper sulphate hydrated `(CuSO_(4).5H_(2)O)`. We CONCLUDE that water of crystallisation makes a difference in the state and colour of the compound.