What is an anhydrous salt?

Anhydrous means without water. The anhydrous salt is only the cation and anion making up the salt. All of these hydrated salts can have the water removed by heating and the physical appearance of the dehydrate or anhydrous form of the salt can be quite different from that of the hydrated salt.

Example: Cupric sulfate is a salt created by treating cupric oxide with sulfuric acid. This forms as large, bright blue crystals containing five molecules of water (CuSO4∙5H2O) and is also known as blue vitriol. The anhydrous salt is created by heating the hydrate to 150 °C (300 °F).


Simply Easy Learning

Updated on: 10-Oct-2022


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