Question

Why do the colour & solution of copper sulphate change when we take a solution of

copper sulphate in a beaker and put an iron nail in it?​

Answer 1

• As the reactivity of iron is more than copper therefore iron displaces copper from its solution forming iron sulphate and changing the colour of the solution pale green from blue with brownish red deposit over iron nail.

Answer 2

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

The reaction is

CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)