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mean activity of an electrolyte in solution

Defined by the equation:
a ± = e ( μ B − μ B ⦵ ) ν R T
where μ B is the chemical potential of the solute B in a solution containing B and other species. The nature of B must be clearly stated: it is taken as a group of ions of two kinds carrying an equal number of positive and negative charges, e.g. Na+ + NO3 or Ba2+ + 2Cl or 2Al3+ + 3SO42− . v is the total number of ions making up the group i.e. 2, 3 and 5 respectively in the above examples. μ B ⦵ is the chemical potential of B in its standard state, usually the hypothetical ideal solution of concentration 1 mol kg −1 and at the same temperature and pressure as the solution under consideration.
See also: activity
PAC, 1974, 37, 499 (Electrochemical nomenclature) on page 510
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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