Nernst equation


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Nernst e·qua·tion

(nārnst),
the equation relating the equilibrium potential of electrodes to ion concentrations; the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium: E = [RT / nF] [ln (C1/C 2)], where E = potential, R = absolute gas constant, T = absolute temperature, n = valence, F = the Faraday, ln = the natural logarithm, and C1 and C2 are the ion concentrations on the two sides; in nonideal solutions, concentration should be replaced by activity.
See also: activity (2).

Nernst equation

Etymology: Hermann W. Nernst, German physicist, 1864-1941; L, aequare, to make equal
an expression of the relationship between the electrical potential across a membrane and the ratio between the concentrations of a given species of permeant ion on either side of the membrane.

Nernst e·qua·tion

(nernst ĕ-kwā'zhŭn)
The equation relating the equilibrium potential of electrodes to ion concentrations; the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium: E = [RT/nF] [ln (C1/C2)], where E = potential, R = absolute gas constant, T = absolute temperature, n = valence, F = the Faraday, ln = the natural logarithm, and C1 and C2 are the ion concentrations on the two sides; in nonideal solutions, concentration should be replaced by activity.
See also: activity (2)

Nernst,

Walther, German physicist and Nobel laureate, 1864-1941.
Nernst equation - the equation relating the electrical potential and concentration gradient of an ion across a permeable membrane at equilibrium.
Nernst potential
Nernst theory - that the passage of an electric current through tissues causes a dissociation of the ions.

Nernst equation

gives the amplitude and sign of the electronic potential created when a semipermeable membrane separates charged ions.
References in periodicals archive ?
Fluoride ion-selective electrodes respond to the fluoride concentration in a non-linear relationship following the Nernst Equation [18].
To calculate which protein is more likely to end up with the NO 'hot potato,' caspases or XIAP, the researchers created a new version of the Nernst equation - a 19th century mathematical equation taught in every general chemistry class.
The concentration of the hydrogene ions of an unknown pH solution is expressed ideally with the Nernst equation (International Organization for Standardization, 1992):
Nernst equation ensures that redox reaction between the oxidized centers and the counter-ions will be completed instantaneously to reach the equilibrium as long as the voltage scan is slow.
The half-cell potential for each reaction is determined with the Nernst equation.