Comparative study on uni-univalent and uni-bivalent ion-exchange reaction on Doulite A-116

Determination of ion-exchange equilibrium constant (K) for Cl(-)/I(-) and Cl(-)/C(2)O (4) (2-) system was studied at different temperatures from 25 to 45A degrees C and by varying concentration of iodide and oxalate ion solution. For both uni-univalent and uni-bivalent exchange systems, using 0.5 g of ion-exchange resin DUOLITE A-116 (in chloride form), the value of K increases with rise in temperature i.e., from 13.0 at 25A degrees C to 19.05 at 45A degrees C for Cl(-)/I(-) system and 33.0 at 25A degrees C to 63.0 at 45A degrees C for Cl(-)/C(2)O (4) (2-) system indicating the endothermic ion-exchange reaction. The difference in K values at the same temperature for the two was related to the ionic charge of exchangeable ions in the solution.