The standard reduction potential for the half-reaction: Sn4+ + 2e- --> Sn2+ is +

Question

The standard reduction potential for the half-reaction: Sn4+ + 2e- --> Sn2+ is +0.15 V. Consider data from the table of standard reduction potentials for common half-reactions, in your text. For a galvanic cell under standard conditions, which of the following anodic half reactions would produce, at the cathode a spontaneous reduction of Sn4+ to Sn2+ but not Sn2+ to Sn.

Sn --> Sn2+ + 2e-

H2 + 2OH- --> 2H2O + 2e-

Fe --> Fe2+ + 2e-

Pb + SO42- --> PbSO4 + 2e-

Sn2+ --> Sn4+ + 2e-

Ni --> Ni2+ + 2e-

Explanation / Answer

The standard reduction potential data is referred in this case.

The standard reduction potential of all the half cells given have potential in -ve, that mean they all can act as the reducing agent for Sn4+/Sn2+ reduction and act themselves as an anode.

Only the reduction potential of Sn4+/Sn2+ is greater than Sn2+/Sn half cell, that is Sn2+/Sn4+ can act as an anode for the reduction for Sn4+/Sn2+ but not Sn2+/Sn. This could thus be an concentration cell.

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