Regular solution theory is used to calculate the values of thermo-dynamic exchange constants from experimental curves obtained in the titration of hydrogen-saturated clays by strong bases. Investigated were the exchanges in the hydrogen clays beidellite, illite, kaolinite and bentonite upon titration with KOH, NaOH, or NH ~4~ OH. In agreement with the results of Garrels and Christ (1950) and Blackmon (1958), it is found that a single hydrogen clay behaves as a mixture of two distinct weak acids, that is, each clay contains two energetically different homogeneous sets of exchange sites, with the equivalent exchange capacity of the first site much larger than that of the second site.
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Truesdell et al. (1968) studied this question.