Water of crystallization is the fixed number of water molecules present in one formula unit of a

Crystallization of water is water molecules that are present inside crystals.

Ex : 1) $\text{CaC}{l}_2.2{\text{H}}_{\text{2}}\text{O}$  2) $\text{ZnC}{l}_2.4{\text{H}}_{\text{2}}\text{O}$ 3) ${\text{CaSO}}_4.2{\text{H}}_{\text{2}}\text{O}$  4) ${\text{CuSO}}_4.5{\text{H}}_{\text{2}}\text{O}$  

5) ${\text{Na}}_{\text{2}}{\text{CO}}_3.10{\text{H}}_{\text{2}}\text{O}$ 6) $\text{COC}{l}_2.6{\text{H}}_{\text{2}}\text{O}$ 7) ${\text{FeSO}}_4.7{\text{H}}_{\text{2}}\text{O}$ 8) $\text{RhC}{l}_3.3{\text{H}}_{\text{2}}\text{O}$ 

 9) ${\text{Na}}_{\text{2}}{\text{SO}}_4.10{\text{H}}_{\text{2}}\text{O}$