Dilute aqueous solutions of unsymmetrical quaternary ammonium iodides. Part 2.—Conductance measurements

Abstract

Precise conductance measurements on dilute aqueous solutions of cyclic and straight chain quaternary ammonium iodides at 298 K are reported. The results are analyzed with the Fuoss-Hsia and Pitts equations for Λ(c) and are shown to provide some evidence for a slight amount of ion association which varies systematically with cation size and is most marked for the larger cations. The ionic resistivity (1/λ°₊) of the cation increases by a constant amount (2.1 × 10^–3Ω cm^–2 mol) per CH₂ group and can be related to estimates of the cation volumes V₊ by the equation λ°₊V^⅔₊=q.