Nernst Equation
Brief table of contents Application of the Nernst equation in problem solving. Potentiometric methods of analysis The Nernst equation and its various forms Nernst Equation The Nernst Equation enables the determination of cell potential under non-standard conditions. It relates the measured cell potential to the reaction quotient and allows the accurate determination of equilibrium constants (including solubility constants). Introduction The Nernst Equation is derived from the Gibbs free energy under standard conditions. Eo=Eoreduction−Eooxidation (1) ΔGΔG is also related to EE under general conditions (standard or not) via ΔG=−nFE (2 with nn is the number of electrons transferred in the reaction (from balanced reaction), FF is the Faraday constant (96,500 C/mol), and EE is potential difference. Under standard conditions, Equation 22 is then ΔGo=−nFEo. (3 Hence, when EoEo is positive, the reaction is spontaneous and when EoEo is negative, the reaction is non-spontaneous. Fr...