Question

A solution of copper sulphate was stored in a beaker made of aluminium metal. After about an hour it was observed that the blue colour of the solution faded and the inner surface of the container is spoiled.
(a) Why does the blue colour fade?
(b)Why is the inner surface of the beaker spoiled? Show it by a balanced chemical equation.
(c)Which substance is oxidized and which substance is reduced in the process?​

Answer 1

Answer:

a) due to displacement reaction

b) reaction is { Fe(s)+CuSO4(aq) gives FeSO4(aq)+Cu(s)

(copper sulp). (iron sulp)

c) oxidised= Fe reduced=Cu

Explanation:

In a displacement reaction a more powerful metal displaces another metal from its salt solution.

In this case aluminium is more reactive than copper hence it has displaced it from its salt solution and had turned the solution fade and made it green with giving a brownish layer (spoiler).