STANDARD ELECTRODE POTENTIAL

"The equilibrium potential of an electrode when both the oxidized and the reduced species are present in unit concentration (strictly speaking, activity) in the solution; if the ""reduced"" form is a metal, a pure metal (not alloyed with other metals) is considered to be at unit concentration. (See also the Nernst equation.) The standard potentials are always expressed against the standard hydrogen electrode the potential of which is zero ""by definition."" Standard potentials are a function of the temperature, they are usually tabulated for 25 oC. Also called ""normal electrode potential."" "