Equivalent and Ionic Conductances for Sodium and Potassium Chlorides in Anhydrous Methanol at 25°C

Abstract

The conductance of sodium and potassium chlorides has been determined in anhydrous methanol for concentrations from 0.0002 N to 0.01 N. For trace amounts of water, the decrease in equivalent conductance for a given electrolyte concentration is proportional to the water content, the proportionality factor being a function of the ionic strength. The results up to 0.002 N satisfy the Onsager-Shedlovsky equation. The limiting conductances, when combined with the transference data of the preceding paper, give the first precise limiting ionic conductances in an anhydrous solvent. The limiting values for chloride ion are the same for the two salts within experimental precision; but with increasing concentration, there are deviations from the Kohlrausch rule of independent ionic mobilities which are considerably greater than is the case in aqueous solution. The equivalent conductance data are in definite disagreement with Frazer and Hartley's results for the two salts in this solvent.