The standard reduction potential for the half-reaction Sn4+ + 2e- --> Sn2+ is +0
ID: 1020883 • Letter: T
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 cathodic half reactions would produce, at the anode, a spontaneous oxidation of Sn to Sn2+ but not Sn2+ to Sn4+.
yes no Fe2+ + 2e- --> Fe
yes no 2H2O + 2e- --> H2 + 2OH-
yes no 2H+ + 2e- --> H2
yes no Cu2+ + e- --> Cu+
yes no Pb2+ + 2e- --> Pb
yes no PbSO4 + 2e- --> Pb + SO42-
Explanation / Answer
yes no Fe2+ + 2e- --> Fe
yes no 2H2O + 2e- --> H2 + 2OH-
no 2H+ + 2e- --> H2 E0 = 0.00V it not act as cathode half cell
yes Cu2+ + e- --> Cu+ E0 = 0.16V it act as cathode half cell
no Pb2+ + 2e- --> Pb E0 = -0.13V it not act as cathode half cell
no PbSO4 + 2e- --> Pb + SO42- E0 = -0.13V it not act as cathode half cell
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