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Q. What do we call the number of water molecules present in one formula unit of a salt?
Answer: Water of crystallisation
Notes: The fixed number of water molecules present in one formula unit of a salt is called water of crystallisation. For example, one formula unit of copper sulphate has five molecules of water in it.

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Question Number: 26 in Chemistry-12-Acids, Bases and Salts in above course in App.