Improvement in the measurement of diffusion coefficients in a restricted diffusion cell: Case of binary electrolytes

The paper deals with measuring the diffusion coefficient of an electrolyte by the restricted diffusion method. A new design for the cell was proposed together with a more accurate solution of Fickʹs law for the boundary conditions considered: in particular, the initial concentration gradient between the dilute and the more concentrated solutions was taken into account and the numerical solution obtained described the total transient phenomenon. The new arrangement has been tested using the conductimetric technique, for the case of binary diffusion of potassium chloride and sulfuric acid at 25 °C