Comparative Study on Uni-Univalent and Uni-Bivalent Ion Exchange Reaction as a Function of Ionic Charge

Abstract

Determination of equilibrium constant of Cl^-/I^- and Cl^-/C₂O₄^2-  ion
exchange reaction was carried out in the temperature range of
30-45°C, by varying the concentration of iodide and oxalate ion
solution. It was observed that under identical conditions of temperature
30°C, using 0.5 g of ion exchange resin (in chloride form), the
equilibrium constant (K) for Cl^-/l^- exchange was 16.7 which was
lesser than 19.5 for Cl^-/C₂O₄^2-  exchange. Also for both uni-univalent
and uni-bivalent exchange, value of K increases with increase in
temperature, indicating the endothermic ion exchange reaction with
enthalpy values of 19.13 kJ/mole and 12.2 kJ/mole respectively.