Dynamic buffer capacity versus alkalinity. Formulation in terms of Simms constants idea

Abstract

The Simms constants (gi) concept is put in context with equations for some acid-base titration curves, formulated for D+T systems, with titrand D and titrant T prepared according to normal and isomolar mode. The relationships between gi and successive dissociation constants (Ki) values for polyprotic acids are formulated. The mathematical formulation of dynamic buffer capacity concept is presented in general and elegant form, involving all soluble species formed in the system where only acid-base reactions are involved. The Simms constants are identified with protonation micro-constants related to specific basicity centers.