Activity-measurement by the partition method.—I

Abstract

In the light of Milner’s calculation of the mean electrostatic potential in chaos of ions, activity-measurement is of special interest at low concentrations aqueous, and still lower concentrations in non-aqueous solution, owing to the simple and peculiar dilution law which the theory predicts for such consentrations. The methods which have chiefly been relied on for such data—that of the Freezing-point depression and that of the concentration cell-—tend to lose recision at low concentrations, owing, in the former, to the smallness of the depression measured, and in the latter, to polarisation effects.