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medium effect

The medium effect on ionic species B due to transfer from solvent S 1 to solvent S 2 (number) is defined by
R T ln γ S 1 S 2 B = μ B o , S 2 − μ B o , S 1
where R is the gas constant, T is the thermodynamic temperature and μ B o , S i is the standard chemical potential of B in solvent S i (where i = 1 or 2), the reference states being the same in both solvents. γ S 1 S 2 B is not an exactly measurable quantity.
PAC, 1974, 37, 499 (Electrochemical nomenclature) on page 508
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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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