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  • Salts exist in the form of formula units
  • To these formula units of a salt, a fixed number of molecules of water remain attached. This is known as the Water of Crystallization.
  • For example:

    Copper Sulphate (CuSO 4 ) is ideally white and powdery and does not have any water (anhydrous). 

    When we add water to these crystals they turn blue due to the formation of Copper pentahydrate (CuSO 4 .5H 2 O). 

    These 5 water molecules present in the structure of salts hydrating the salt is called water of crystallisation .

Examples of Water of Crystallization-01.jpg

Water of Crystallization... Why-01.jpg


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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo