IONIZATION AND DISSOCIATION OF WEAK ELECTROLYTES - AN INITIAL APPROACH TO KI AND KD EVALUATION

The experimental dissociation constant K of weak electrolytes may be considered as derived from different contributions due to the Ionization, Ki, and dissociation, Kd, equilibria, respectively. A simple method for Kiand Kd evaluation is herein proposed, starting from experimental K data, obtained by the conductometric method, for picric acid in a set of binary solvent system mixtures at temperatures ranging from -10 to +80 °C. The correlations between Kiand T and between Kd and T are moreover suggested on the basis of a general expression derived from the integrated Van't Hoff equation. © 1990, American Chemical Society. All rights reserved.