Conductance studies of alkali-metal chlorides and bromides in 2-methoxyethanol at 25 °C

Abstract

The conductances of a number of alkali-metal chlorides and bromides, MX(M⁺= Li, Na, K, Rb, Cs and X^–= Cl, Br) have been measured in 2-methoxyethanol (ME) at 25 °C and the data have been analysed by the 1978 Fuoss Conductance equation in terms of the limiting molar conductance Λ°, the association constant, K_A and the association distance, R. Single ion conductivities have been determined using Bu₄NBPh₄ and Bu₄NBBu₄ as reference electrolytes. Strong association was found for all these salts in ME and the limiting conductances (Λ°) were in the order Li > Na < K < Rb < Cs and Cl > Br. Evaluation of stokes radii indicates that NaCl and NaBr form ion pairs with fully solvated ions while in other cases some solvent molecules are perhaps included in the ion pair.