Topic summary
Standard electrode potential (data page)
The data below tabulates standard electrode potentials (E°), in volts relative to the standard hydrogen electrode (SHE), at:
- Temperature 298.15 K (25.00 °C; 77.00 °F);
- Effective concentration (activity) 1 mol/dm for each aqueous or amalgamated (mercury-alloyed) species;
- Unit activity for each solvent and pure solid or liquid species; and
- Absolute partial pressure 101.325 kPa (1.00000 atm; 1.01325 bar) for each gaseous reagent — the convention in most literature data but not the current standard state (100 kPa (0.99 atm; 1.0 bar)).
Variations from these ideal conditions affect measured voltage via the Nernst equation.