Buffer Capacity of a Polyprotic Acid: First Derivative of the Buffer Capacity and pK a Values of Single and Overlapping Equilibria

摘要: Buffer capacity appears in a variety of fields, and its approximate calculation is practical importance for the design new buffer solutions, being also quantity related to titrations. The aims this paper are (i) devise simple expressions first derivative polyprotic acid, which may be easily extended mixture acids, e.g., universal solutions; (ii) evaluate overlapping acidity constants (pKa′ s) diprotic from knowledge singular points curve; (iii) at same time provide critical overview topic, with some twist novelty. Hyperbolic functions analytical chemistry have been surveyed. Conditions appearance curve monoprotic acids pKa values established. Methods strong moderate pKa′ s suggested applied literature data. To check computed v...