Water of crystallization (with proper example)

i.                     Water of crystallization is the fixed number of water molecules present in the crystal structure.

ii.                    For example, chemical formula of hydrated copper sulphate is CuSO₄.5H₂O. Copper sulphate has 5 molecules of water of crystallization.

iii.                  Sodium carbonate is Na₂CO₃.10H₂O. Sodium carbonate has 10 molecules of water of crystallization.

iv.                  On heating or on exposure to air, the above salts lose water of crystallization and form anhydrous substances.