Question

# What do you mean by the water of crystallization of substance? Describe the activity to show that blue copper sulfate contains water of crystallization.

The water of crystallization or the water of hydration is the water that occurs in the crystals. It is denoted as a hydrated compound $n{{H}_{2}}O$.
Let's consider an example gypsum is a soft mass having the formula $CaS{{O}_{4}}.2{{H}_{2}}O$. When we heat gypsum, plaster of Paris is formed by losing the water of crystallization. The Plaster of Paris is a hard mass with the formula ${{(CaS{{O}_{4}})}_{2}}.{{H}_{2}}O$.
Note: The water of crystallization is the fixed number of water molecules present in one formula unit of salt. Five water molecules are present in one formula unit of blue copper sulfate. The chemical formula for hydrated blue copper sulfate is $CuS{{O}_{4}}.~5{{H}_{2}}O$ .