| Reduction half reaction | Potential , Eo /volts |
| Li+ + e− → Li(s) | -3.045 |
| K+ + e− → K(s) | -2.924 |
| Ca2+ + 2e− → Ca(s) | -2.760 |
| Na+ + e− → Na(s) | -2.7109 |
| Al3+ + 3e− → Al(s) | -1.706 |
| Mn2+ + 2e− → Mn(s) | -1.029 |
| Cd(OH)2(s) + 2e− → Cd(s) + 2OH− | -0.812 |
| Zn2+ + 2e− → Zn(s) | -0.7628 |
| Cr3+ + 3e− → Cr(s) | -0.740 |
| Fe2+ + 2e− → Fe(s) | -0.409 |
| PbSO4(s) + 2e− → Pb(s) + SO4 2- | -0.356 |
| Ni2+ + 2e− → Ni(s) | -0.230 |
| Sn2+ + 2e− → Sn(s) | -0.1364 |
| Pb2+ + 2e− → Pb(s) | -0.1263 |
| 2H+ + 2e− → H2(g) | 0.0000000 |
| Sn4+ + 2e− → Sn2+ | +0.150 |
| IO3− + 2H2O +4e− → IO− + 4OH− | +0.150 |
| SO42- + 4H+ + 2e− → H2SO3 + H2O | +0.200 |
| Cu2+ + 2e− → Cu(s) | +0.3419 |
| O2(g) + 2H2O(l) + 4e− → 4OH - | +0.401 |
| IO− + H2O + 2e− → I− + 2OH− | +0.485 |
| NiO2(s) + 2H2O + 2e− → Ni(OH) 2(s) + 2OH− | +0.490 |
| I2(s) + 2e− → 2I− | +0.535 | MnO2(s) + e− + 2H2O → Mn(OH)3(s) + OH− | +0.620 ‡ |
| Fe3+ + e− → Fe2+ | +0.770 |
| Ag+ + e− → Ag(s) | +0.7996 |
| ClO− + H2O(l) + 2e− → Cl− + 2OH− | +0.900 |
| NO3− + 4H+ + 3e− → NO(g) + 2H 2O(l) | +0.960 |
| Br2(l) + 2e− → 2Br− | +1.065 |
| O2(g) + 4H+ + 4e− → 2H2O(l) | +1.229 |
| Cr2O7− + 14H+ + 6e− → 2Cr3+ + 7H2O | +1.330 |
| Cl2 + 2e− → 2Cl− | +1.3583 |
| MnO4− + 8H+ + 5e− → Mn2+ + 4H2O | +1.507 |
| Au+ + e− → Au(s) | +1.680 |
| PbO2(s) + 4H+ + SO4 2- + 2e− → PbSO4(s) + 2H2O(l) | +1.685 |
| F2(g) + 2e− → 2F− | +2.870 |