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Explain an activity to show the water of...

Explain an activity to show the water of crystallisation in `CuSO_4.5H_2O`.

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1) Take a few crystals of copper ·sulphate in a dry test tube and heat the test tube.
2) We observe water droplets on the walls of the test tube and salt turns white.
3) Add 2 - 3 drops of water on the sample of copper sulphate obtained after heating.
4) We observe the blue colour of copper sulphate crystals is restored.
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