Study on Effect of Ionic Charge on Ion Exchange Equilibria Involving Uni-Univalent and Uni-Bivalent Ion Exchange

Abstract

The equilibrium constant (K) for uui-univalent Cl^-/Br^- and unibivalent
Cl^-/SO₄^2-   exchange systems is studied at different temperatures
from 30-45°C, using different concentrations of bromide and
sulphate ions. The K values for both the exchange reactions increases
with increase in temperature indicating the endothermic ion
exchange reaction having enthalpy values of 45.91 kJ/mole and 11.5
kJ/mole respectively. The equilibrium constant (K) for Cl^-/Br^- ion
exchange is 1.16 at 30^oC which is lower than 20 at 30°C for
Cl^-/SO₄^2- exchange, which is due to the difference in ionic charge
of the exchangeable counter ions.