Nernst equation

From Academic Kids

In electrochemistry, the Nernst equation gives the electrode potential (E), relative to the standard electrode potential, (E0), of the electrode couple or, equivalently, of the half cells of a battery. In physiology the Nernst equation is used for finding the electric potential of a cell membrane with respect to one ion.

<math>

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

At room temperature the following is true

<math>

E = E^0 - \frac{0.0591}{n} \log\frac{[\mbox{red}]}{[\mbox{ox}]} <math>

For a cell membrane potential with respect to one ion

<math>

E = E^0 - \frac{0.0591}{n} \log\frac{[\mbox{ion out of cell}]}{[\mbox{ion inside cell}]} <math>

History

The Nernst equation is named after the German physical chemist Walther Nernst who first formulated it.

See also

de:Nernst-Gleichung fr:quation de Nernst nl:Wet van Nernst ja:ネルンストの式 pl:Rwnanie Nernsta sl:Nernstov potencial

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