Cell Potentials
The standard potential of a voltaic cell can be calculated from the values in the table of standard reduction potentials shown in Table 1.
Table 1: Standard Reduction Potentials
Half-Reaction | Standard Potential (volts)
Na+(aq) + e- → Na(s) | 2.71
Mg2+(aq) + 2e- → Mg(s) | 2.37
Al3+(aq) + 3e- → Al(s) | 1.66
Zn2+(aq) + 2e- → Zn(s) | 0.76
Cr3+(aq) + e- → Cr(s) | 0.74
Fe2+(aq) + 2e- → Fe(s) | 0.44
Ni2+(aq) + 2e- → Ni(s) | 0.26
Sn2+(aq) + 2e- → Sn(s) | 0.14
Pb2+(aq) + 2e- → Pb(s) | 0.15
H2(g) + 2H+(aq) + 2e- → 2H2O(l) | 0.34
Sn4+(aq) + 2e- → Sn2+(aq) | 0.40
AgCl(s) + e- → Ag(s) + Cl-(aq) | 0.80
O2(g) + 4H+(aq) + 4e- → 2H2O(l) | 1.23
