The conductances of several quaternary ammonium bromides and iodides in dimethylformamide have been measured at 25°. In each case, the observed slope of the plot of the equivalent conductance versus the square root of the concentration was more negative than that predicted by the Onsager equation. Limiting equivalent conductances and dissociation constants have been determined by the Shedlovsky extrapolation method. The quaternary ammonium halides being dissociated to a lesser extent than some potassium and sodium halides is strong evidence that the latter cations are rather highly solvated in dimethylformamide. Bromides were found to be 1.6 ± 0.1 ohm-1 cm.2 more conducting than the corresponding iodides. Data are presented showing that the ratio of the conductance in acetone to that in dimethylformamide is 2.32 ± 0.09 for each of seventeen salts.

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