Entropy-supported ion-pair formation in liquid ammonia

Abstract

The concentration dependence of the electrolytic conductance of KCI, KBr, KI, KNO₃ and KSCN in solution in liquid ammonia has been recorded in the temperature range 208–238 K. Computer evaluation of the experimental data led to the ion-pair formation constants K, which increase significantly with increasing temperature. ΔH° and ΔS° for the processes were calculated from the temperature dependence of K. The ΔH° and ΔS° data demonstrated that ion-pair formation in liquid ammonia is entropy-supported, with unfavourable enthalpy.