WATER SOLUBILITY OF SPARINGLY SOLUBLE SALTS OF WEAK ACIDS AND OR BASES - IMPROVED-ACCURACY CALCULATION METHODS/

Methods are described for accurate calculations of the water solubilit ies of sparingly-soluble salts derived from weak acids and/or bases, w hen the known data are the solubility product and the ionization const ants. Various cases are considered, with their possible extensions. Tw o successive-substitution, always-converging algorithms are developed for a rigorous treatment of some cases, for which also an approximate treatment is proposed. For other cases, an interval-bisection algorith m is suggested. Conditions under which the conventional formulae can b e safely employed are established. Practical examples of calculations are given and discussed.