Selective Oxidation The standard reduction potential for the half-reaction Sn4+
ID: 558021 • Letter: S
Question
Selective Oxidation
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 or No)
1. Sn4+ + 2e- --> Sn2+
2. PbSO4 + 2e- --> Pb + SO42-
3. Fe3+ + 3e- --> Fe
4. 2H+ + 2e- --> H2
5. 2H2O + 2e- --> H2 + 2OH-
6. Sn2+ + 2e- --> Sn
Explanation / Answer
if E°cell > 0, this is spontaneous
then
E < 0.15 V in order to be E°cell > 0
PbSO4(s) + 2 e Pb(s) + SO42 0.3588 ; will do
Fe3+ + 3 e Fe(s) 0.04; will do
2H+ + 2e- --> H2 0; will do
2H2O + 2 e H2(g) + 2 OH 0.8277 ; will do
Sn2+ + 2 e Sn(s) 0.13 ; will do
Note that all will produce a spontaneous process
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