Ionic association of alkali-metal bromides in 2-methoxyethanol

Abstract

Conductance data are reported for alkali-metal bromides MBr (M = Li, Na, K, Rb, Cs), NaBPh₄ and Ph₄PBr in 2-methoxyethanol at 19 temperatures in the –10 ⩽t/°C ⩽ 80 range. The experimental data were processed by the Fuoss–Hsia equation which provides the dissociation constant (K), the limiting equivalent conductivity (Λ₀), and the ion-size fitting parameter (å).

All the studied electrolytes were found to be associated to form solvent-separated ion-pairs in solution. The thermodynamic behaviour of the investigated solutions has been derived by analysing the dissociation constant values. Ionic limiting equivalent conductances for all the species were calculated using the fundamental assumption of Ph₄PBPh₄ as reference electrolyte.