CURRENT THEORIES IN THE CALCULATION OF ACTIVITY-COEFFICIENTS .2. SPECIFIC INTERACTION THEORIES APPLIED TO SOME EQUILIBRIA STUDIES IN SOLUTION CHEMISTRY

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