Question

Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. So the colour of blue solution changes to green and a brown deposit appears on the iron nails. Green colour of the solution is due to the formation of
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Answer 1

The green colour of the solution is due to the formation of Ferrous sulphate $FeSO_{4}$

Explanation:

• The nail gets a brownish coating and the copper sulphate solution turns green.

• The nail has a coating of Copper on its surface and the solution is detected to have the presence of an iron-containing compound known as Ferrous sulphate ($FeSO_{4}$)

                          $Fe(s)\;+\;CuSO_4(aq)\;\rightarrow\;Cu(s)\;+\;FeSO_4(aq)$

• Here, iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as $Fe^{2+}$ ions and ferrous sulfate solution is formed.