Equation icon  Nernst equation

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Resource type: Equation
Description: The Nernst equation links the equilibrium potential of an electrode to its standard potential and the concentrations or pressures of the reacting components at a given temperature. It describes the electrode potential for a given reaction as a function of the concentrations (or pressures) of all participating chemical species.

TeX format: E_e = E^0 - \frac{2.303RT}{zF}\log{ \left|\frac{[reduced]}{[oxidised]}\right |}

Ee {E_e} = Electrode potential (V) {V}
E0 {E^0} = Standard potential (V) {V}
R {R} = Universal gas constant (JK-1mol-1) {JK^{-1}mol^{-1}}
T {T} = Temperature (K) {K}
z {z} = Number of moles of electrons
F {F} = Faraday constant (Cmol-1) {Cmol^{-1}}

The notation [reduced] represents the product of the concentrations (or pressures where gases are involved) of all the species that appear on the reduced side of the electrode reaction, raised to the power of their stoichiometric coefficients. The notation [oxidised] represents the same for the oxidised side of the electrode reaction.

Keywords: corrosion • electrode • cathode • cathodic • Nernst • potential • chemical • reaction • electrolytic
Categories: Science approaches
Science approaches > Corrosion & degradation > Corrosion principles
Science approaches > Corrosion & degradation > Forms of corrosion
Science approaches > Corrosion & degradation > Corrosion protection
Properties > Chemical & biological > Environmental
Other topics > Life cycle analysis
Created by: The University of Liverpool
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Date created: 14 July 2010
Date added: 04 August 2010
Resource ID: 3189