Consider the following standard reduction potentials in acid solution. Which hal
ID: 924704 • Letter: C
Question
Consider the following standard reduction potentials in acid solution. Which half reaction is the most
favored process thermodynamically?
Sn4+ + 2e– --> Sn2+ +0.14
O2 + 4e– + 4H+ --> H2O +1.23
Al3+ + 3e– --> Al(s) –1.66
AgBr(s) + e– --> Ag(s) + Br– +0.07
Fe3+ + e– --> Fe2+ +0.77
A.Sn4+ + 2e– --> Sn2+ +0.14
B.O2 + 4e– + 4H+ --> H2O +1.23
C.Al3+ + 3e– --> Al(s) –1.66
D.AgBr(s) + e– --> Ag(s) + Br– +0.07
E.Fe3+ + e– --> Fe2+ +0.77
Explanation / Answer
The reaction with the highest positive E value is favoured.
Hence the reaction B is highly favoured/