Study of equilibrium constants of Cl-/Br- exchange system using strongly basic anion exchanger amberlite IRA-400

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 30 degrees C to 45 degrees C. Mole fraction of bromide ion exchanged in the resin (N-Br(-)) and mole fraction of chloride ion remained in the resin (NCl-) 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.