Question

Define water of crystallization. Give the chemical formula for two compounds

as examples. How can it be proved that the water of crystallization makes a

difference in the state and colour of the compounds?​

Answer 1

Explanation:

1.Water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Or we can say water stoichiometrically bound into crystal. For example, chemical formula of hydrated copper sulphate is CuSO4 · 5H2O. Copper sulphate has 5 molecules of water of crystallisation.

2.Water of crystallisation are water molecules that form an essential part of the crystal structure of some compounds.

Thus, the water of crystallisation is responsible for the geometric shape and colour of the crystals.

For example, Glauber's salt (Sodium sulphate decahydrate) Na

2

SO

4

.10H

2

O has ten water of crystallisation and it is responsible for the colourless monoclinic geometry of the crystals.

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