Nernst equation

The Nernst equation gives the electrochemical cell potential under non-standard conditions, correcting the standard potential for temperature and reaction quotient. It is used to calculate electrode and cell voltages when concentrations differ from standard values.

E_{\mathrm{cell}}=E_{\mathrm{cell}}^\ominus-\frac{RT}{zF}\ln Q_{\mathrm{r}}

What the symbols mean

cell potential under the actual conditions (V)
standard cell potential (V)
molar gas constant (J·mol⁻¹·K⁻¹)
thermodynamic temperature (K)
number of electrons transferred in the reaction
Faraday constant (C·mol⁻¹)
reaction quotient

About this formula

  • FieldChemistry
  • TopicElectrochemistry
  • LevelUniversity
  • Also calledNernst equation electrochemistry, cell potential under non-standard conditions, electrode potential formula, Nernst potential, reaction quotient cell voltage, E cell Nernst
  • SourceWikidata Q751124

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