Study of temperature effect on uni-univalent/bivalent ion exchange reaction

Ion exchange equilibrium constant (K) for Cl-/Br- and Cl-/C2O42- systems was studied at different temperatures from 30 to 45 degreesC. For both uni-univalent and uni-bivalent exchange systems, the value of K increases with rise in temperature, i.e., from 1.16 at 30 degreesC to 2.95 at 45 degreesC for Cl-/Br- system and 19.5 at 30 degreesC to 30.0 at 45 degreesC for Cl-/C2O42- system indicating the endothermic ion exchange reaction. The difference in K values at the same temperature for the two systems was related to the ionic charge of exchangeable ions in the solution.