Solutions of electrolytes in liquid ammonia. Part II. The mean molal ion activity coefficients in ammonium nitrate solutions at –40 °C

Abstract

The mean molal activity coefficients in solutions of ammonium nitrate in liquid ammonia have been determined at –40 °C by the use of a concentration cell with transference which contained hydrogen electrodes. The activity coefficient decreases very rapidly with increasing concentrations so that in 0·01 molal solution it is 0·265. Above this value it continues to decrease but much less markedly.

The shape of the plot of molality against activity coefficient is similar to that obtained by Monoszan and Pleskov but the activity coefficients obtained are markedly lower. The deviation of the system from the Debye–Hückel theory is discussed.