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

• Published in: Chemical engineering and processing Vol. 36; no. 2; pp. 161 - 165
• Main Authors: Nzikou, Jean Mathurin, Baklouti, Melika, Vincent, Louis-Marie, Lapicque, François
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-1997; Elsevier
• Subjects: Conductimetry; Diffusion coefficients; Electrolyte solutions; Engineering Sciences; Potassium chloride; Restricted diffusion; Sulfuric acid; Restricted diffusion; Electrolyte solutions; Potassium chloride; Diffusion coefficients; Conductimetry; Sulfuric acid; electrolyte solutions; potassium chloride; restricted diffusion; sulfuric acid; diffusion coefficients; conductimetry
• ISSN: 0255-2701; 1873-3204
• DOI: 10.1016/S0255-2701(96)04180-3

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 Fick's 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