why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Asked by krittikac02 | 16th Jul, 2009, 08:11: PM

Expert Answer:

The cour changes because of displacement reaction.

The reaction is Fe(s) + CuSO4 (aq) FeSO(aq)+ Cu (s)

                             Grey       blue                            green           brown

                                           solution                     solution

This happens because iron is a more reactive element than copper. That is iron comes above copper in the reactivity series. So, iron being a more reactive element than copper dispalces copper from its salt solution ( copper sulphate) and forms iron sulphate and copper metal is formed.

SO the colour of the solution changes from blue to green and a brown deposit of copper is deposited.

Answered by  | 17th Jul, 2009, 10:48: AM

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