Diaphragm-cell studies of diffusion in the four-component system hydrochloric acid–sodium chloride–sodium iodide–water

Abstract

Stokes magnetically stirred diaphragm cells have been used to determine the nine quaternary diffusion coefficients for hydrochloric acid (0.025 mol dm^–3)-sodium chloride (0.000 mol dm^–3)-sodium iodide (0.025 mol dm^–3) in aqueous solution at 25 °C. Onsager transport coefficients determined from the measured diffusion coefficients satisfy the Onsager reciprocal relations for isothermal quaternary diffusion. Equations are developed to estimate quaternary transport coefficients from activity and conductivity data for the constituent binary electrolytes. Predicted transport coefficients are in good agreement with measured values.