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CBSE Class 11-science Answered

Can a solution of 1 M CuSO4 be stored in a vessel made of Nickel metal? Given that E0 Ni, Ni2+ = 0.25 V, E0 Cu, Cu2+ = - 0.34 V
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer

In this problem, we want to see whether following reaction can take   place or not

                   Ni + CuSO4       NiSO4 + Cu
          i.e.     Ni + Cu2+          Ni2+ + Cu
          By convention, the cell may be represented as NiNi2+ Cu2+Cu
          We are given the oxidation potentials as
                   E0Ni,Ni2+ = + 0.25 V and E0Cu,Cu2+ = - 0.34 V
          Hence, the reduction potential will be
                   E0Ni2+Ni = - 0.25 V and E0Cu2+Cu = + 0.34 V
                   E0cell    = E0Cu2+Cu – E0Ni2+Ni
                             = +0.34 – (-0.25)
                             = +0.59 V
          This EMF comes out to be positive which means CuSO4 reacts with nickel. Therefore, CuSO4 solution cannot be stored in a Nickel vessel.
Answered by | 04 Jun, 2014, 03:23: PM
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