Water of Crystallization Definition

Blue crystals of copper sulfate or copper sulphate.
These are blue crystals of copper sulfate pentahydrate, which is known as copper sulphate pentahydrate in the UK. Anne Helmenstine

Definition: Water of crystallization is water that is stoichiometrically bound into a crystal.

Crystal salts containing water of crystallization are called hydrates.

Also Known As: water of hydration, crystallization water

Examples: Commercial root killers often contain copper sulfate pentahydrate (CuSO4·5H2O) cyrstals. The five water molecules are called water of crystallization.