Nernst-Einstein equation

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Kohlrausch's law

Albert Einstein (1879—1955) German-born American theoretical physicist


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An equation relating the limiting molar conductivity Λm0 (see Kohlrausch's law) to the ionic diffusion coefficients, devised by Nernst and Albert Einstein. The Nernst-Einstein equation is Λm0=(F2/RT)(v+z+2D++vz2D), where F is the Faraday constant, R is the gas constant, T is the thermodynamic temperature, v+ and v are the number of cations and anions per formula unit of electrolyte, z+ and z are the valences of the ions, and D+ and D are the diffusion coefficients of the ions. An application of the Nernst-Einstein equation is to calculate the ionic diffusion coefficients from experimental determinations of conductivity.


Subjects: Chemistry.

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