What will happen when an iron nail is dipped in a copper sulphate solution?

When an iron nail is dipped in copper sulphate solution, as iron is higher in reactivity series it will displace copper from its salt. This will make the change in color of copper sulphate from blue to pale green. The reaction looks like:

Fe²⁺(s) + Cu²⁺(aq) → Fe²⁺(aq) + Cu²⁺(s)