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The effect of temperature on theion exchange equilibrium behaviorof binary systems is studied experimentally and modeled. The studyconsiders the exchange between binary systems involving Na+, K+, Ca2+and Mg2+ions with Cl–as a nonexchanging anion on Rohm and Hass gel-typeAmberjet 1200H resin as the ion exchange medium. Experimental equilibriumdata is obtained for the six constitutive binary systems at 4.0, 25.0and 60.0 °C with a total solution concentration of 0.10 N. Thenonidealities in the solution and exchanger phases are modeled byapplying the Pitzer and Wilson models, respectively. Thermodynamicequilibrium constant and Wilson interaction parameters are modeledwith respect to temperature. The model proposed allows the influenceof temperature on the ion exchange equilibrium behavior to be predictedwell. [ABSTRACT FROM AUTHOR]