Collect. Czech. Chem. Commun. 1987, 52, 299-307

The pKBH+ calculation of strong bases: A revision of various methods

Begoña García and José M. Leal

Universidad de Valladolid, Departamento de Química Física, Colegio Universitario Integrado, Burgos, Spain


The pKBH+ values have been obtained for seventeen acid-base equilibriums corresponding to thirteen aniline derivatives in dilute perchloric acid media in the pH region at 25 °C using the spectrophotometric technique. By revising the method of extrapolation to infinite dilution it was possible to introduce new methods for calculating pKBH+ values of strong bases by means of the functions logI = f(pH) and pKap = f(pH). The equation - logfBH+/fB = f(pH) - has been proved to conform to a polynomial function of the third order and is applicable to each compound.