Nernst equation

In electrochemistry, the Nernst equation (named after German physical chemist Walther Nernst) gives the reversal potential[?] of an electrode E, relative to the standard electrochemical potential, E⁰, of the electrode couple or, equivalently, of the half cells of a battery

<math>

E = E^0 - \frac{RT}{zF} \ln\frac{a_{red}}{a_{ox}} </math>

where R is the universal gas constant, T the temperature in Kelvin, z the charge number or valence of the electrode reaction, and a the chemical activities on the reduced and oxidized side, respectively. F is the Faraday constant, equal to 96,494 J volts^-1 mol^-1.

See also: electrodiffusion[?].