CURRENT THEORIES IN THE CALCULATION OF ACTIVITY COEFFICIENTS--II. SPECIFIC INTERACTION THEORIES APPLIED TO SOME EQUILIBRIA STUDIES IN SOLUTION CHEMISTRY

摘要

The adequation of the current theories for calculating activity coefficients has been studied for a series of ionic equilibria in analytical chemistry: the water ionic product as well as two reactions of complex formation and oxidation-reduction. In all the cases, the specific interaction theory (SIT) has proved to be adequate and simple to apply in a restricted interval (0.5-3M), whereas Pitzer's theory is outstanding for its high precision in reproducing experimental behaviour and to correlate values of equilibrium constants for different conditions and media.