The determination of ion association constants from cation exchange measurements—I: The cadmium chloride and cadmium bromide systems

Abstract

Studies of ion association reactions involving cadmium bromide and cadmium chloride have been made using cation exchange equilibrium measurements over the temperature range 0–98°. The cadmium chloride ion pair formation constants increase with temperature over the entire temperature range while those of cadmium bromide initially decrease and then increase at temperatures above about 60°. This results in a change in sign of the value of ΔH° for the bromide ion association constant as the temperature is increased. Values of both the formation constants and enthalpies of formation for those ions agree with those found in the literature at 25°.