A framework is developed which provides predictions of multicomponent ion exchange equilibria from binary data. Experimental data are reported for the ion exchange equilibria of the binary systems SO42−‐Cl−, SO42−‐NO3−, and Cl−‐NO3− on a strong base anion exchange resin. These systems exhibit nonideal characteristics in both phases, and the experimental characterization has been based on the reaction equilibrium constants and correlations for the activity coefficients in both phases. The exchanger phase activity coefficients are obtained from the well known Wilson (1964) model The predictions of the ternary system SO42−‐NO3−‐Cl− based solely on the binary data are consistent with the experimental data for this system.

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