The kinetics of extraction of hydrochloric acid by trilaurylamine dissolved in toluene was investigated as a function of the ionic strength, using lithium chloride, ranging from 0.2M to 3M with a stirred Lewis cell. The rate of acid extraction was found to decrease by increasing the concentration of the supporting electrolyte. The results were explained in terms of a mixed regime (chemical reaction + diffusion). © 1985, Taylor & Francis Group, LLC. All rights reserved.