Abstract
Some alkali and alkaline-earth single-ion activity coefficients have been measured in chloride solutions using only a pH electrode. The ion activity coefficients, by this procedure, are unambiguously defined and easily measured by adopting only a pH convention and the measurements provide for the first time, a set of experimental values consistent with the adopted pH convention (pH = −log [ a H +]). The measurements illustrate that chloride ion activity coefficients are similar in various unassociated chloride solutions of equivalent ionic strengths; consequently, single-ion activity coefficients can be accurately and simply calculated in mixed unassociated chloride electrolyte solutions. Detailed study of equilibria between natural brines and aluminous silicate minerals is now feasible.
Published Version
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