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Applications of Crystallisaion

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Question

A student heated some crystals of hydrated copper sulphate solution. He observed that the blue colour of copper sulphate crystals disappears on heating. What could be the reason behind this? How can he obtain back the blue colour of the copper sulphate crystals? [2 marks]

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Solution

When blue-coloured hydrated copper sulphate crystals are heated, they lose their water of crystallisation and convert into greyish-white-coloured anhydrous copper sulphate crystals. [1 mark]

The blue colour of the copper sulphate crystals can be obtain by adding a few drops of water to anhydrous copper sulphate crystals. [1 mark]

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Q. You are given the following materials:
(i) Iron nails
(ii) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quicklime

Identify the type of chemical reaction taking place when:
(a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed.
(b) On heating copper powder in air in a china dish, the surface of copper powder turns black.
(c) On heating green coloured ferrous sulphate crystals, reddish brown solid is left and smell of a gas having odour of burning sulphur is experienced.
(d) Iron nails when left dipped in blue colour copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.
(e) Quick lime reacts vigorously with water releasing a large amount of heat.
Write chemical equations for each one of the above reactions.

Q. Crystals of copper sulphate are heated in a test tube for some time. What is the colour of copper sulphate (i) before heating and (ii) after heating ? What is the source of liquid droplets seen on the upper side of the test tube during the heating process?

Q. The colour of hydrated crystal of Copper sulphate is:

Give reasons for the following:

On strong heating, blue-coloured copper sulphate crystals turn white.

blue copper sulphate crystals turn while on heating ?

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