Question

The gas produced by heating hydrated Copper sulphate is exposed to blue Cobalt
chloride paper.

Answer 1

Answer:

Students remove the water of crystallisation from hydrated copper(II) sulfate by heating. Condensing the vapour produced in a second test tube collects the water. The white anhydrous copper(II) sulfate is then rehydrated and the blue colour returns.

This experiment can be carried out in pairs by students. It should take no more than 30–40 minutes.

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Answer 2

Answer:

Water Vapour

Explanation:

CuSO4.5H20--->CuSO4 + 5H2O

When hydrated copper sulphate(blue in color) is heated, it loses its water of crystallization and turns white. Water Vapour is evolved. This can be confirmed by using cobalt chloride paper. In presence of moisture/water vapour, blue cobalt chloride turns pink.

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