It is proposed that the standard state for exchangeable cations be selected as mole fraction one-half, rather than the conventional choice of unity. This leads to a more rational interpretation of the thermodynamic equilibrium constant as ion affinities for a surface and greatly simplifies the calculation of thermodynamic functions. The necessity of a complete ion exchange isotherm is eliminated. An example of Li+-Mg2+ exchange on Yolo loam soil is given.
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Babcock et al. (1980) studied this question.
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