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| 1. |
What is meant by water of crystallisation ? How would you show that copper sulphate crystals contain water of crystallisation ? |
| Answer» Solution :Water which is present in the crystals of a COMPOUND is called water of crystallisation. It is DEFINED as the FIXED number of water MOLECULES present in one formula unit of a SALT. Copper sulphate crystals are blue in colour. On heating solid copper sulphate crystals, they lose water of crystallisation and become white. On adding a few drops of water to the white powder, blue colour of copper sulphate is restored. This shows that copper sulphate crystals contain water of crystallisation. | |