• 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 .


  1. Class 10
  2. Chapter 2 Class 10 - Acids, Bases and Salts (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo