Study of Equilibrium Constants of Cl-/Br- Ion Exchange System Using Strongly Basic Anion Exchanger Amberlite IRA-400

Abstract

A known amount of ion exchange resin in chloride form was

allowed to reach equilibrium with bromide ion solutions of five

different concentrations from 0.019 M to 0.042 M at different

temperatures ranging from 30ºC to 45ºC. Mole fraction of bromide

ion exchanged in the resin (N_Br–) and mole fraction of chloride ion

remained in the resin (N_Cl–) were calculated from which the

equilibrium constant (K´) was calculated using Bonner et al. equation.

From the knowledge of equilibrium constants at different

temperatures, enthalpy of ion exchange reaction was obtained to be

45.91 KJoules/mole.