Solutions of electrolytes in liquid ammonia. Part IV. The mean molal ion activity coefficients and ion transference numbers of ammonium iodide

Abstract

The transference number of the ammonium ion in iodide solutions in liquid ammonia at –40 °C (t₊°= 0·3957) is found to be almost independent of the concentration.

The mean molal ion activity coefficients for ammonium iodide solutions at –40 °C have been determined over a range of concentrations (10^–3–10^–1 molal) and correspond closely to those previously obtained for ammonium nitrate solutions in liquid ammonia. This indicates a high degree of similarity of behaviour between these species when dissolved in liquid ammonia.

The similarity in the activity relationships between ammonium nitrate and iodide solutions in liquid ammonia and 2:2 electrolytes in aqueous solutions is also discussed.