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Question

Give two tests for identification of water vapour.


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Solution

Two tests for the identification of water vapours are as follows:

1. In the presence of water vapours, the anhydrous white Copper sulphate (CuSO4) powder turns into blue crystals of Copper sulphate pentahydrate (CuSO4.5H2O).

CuSO4(s)watervapoursCuSO4.5H2O(s)(Coppersulphate)(Coppersulphate)(anhydrous)(hydrated)

2. In the presence of water vapours, the blue Cobalt chloride (CoCl2) powder turns pink due to the formation of hydrated salt Cobalt chloride hexahydrate (CoCl2.6H2O).

When dry Cobalt chloride (blue) comes in contact with water vapours, it turns pink indicating the presence of water vapours.


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