CBSE Class 10 Science 2019 · Paper 31/1/2/C · Question 3
What is water of crystallisation ? Name and give the formula of a salt which contains water of crystallisation.
Answer
Fixed number of water molecules in one formula unit of a crystalline salt; example: copper sulphate pentahydrate, .
Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt in its crystalline form.
Example: copper sulphate pentahydrate (blue vitriol), , which has five molecules of water of crystallisation in each formula unit. (Washing soda, , and gypsum, , are also correct examples.)
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