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Water of Crystallization Definition

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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.

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