A Bilogarithmic Hyperboline Sine Procedure for the Simultaneous Calculation of Successive Formation Constants of Two Step Overlapping Acid-Base Equilibria from Potentiometric Measurements

Julia Martin; Maria Jose Banez Morejon; Agustin G. Asuero

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International Journal of Advanced Research in Chemical Science

Volume 5, Issue 11, 2018, Page No: 43-50

A Bilogarithmic Hyperboline Sine Procedure for the Simultaneous Calculation of Successive Formation Constants of Two Step Overlapping Acid-Base Equilibria from Potentiometric Measurements

Julia Martin^1*, Maria Jose Banez Morejon², Agustin G. Asuero²

1.Department of Analytical Chemistry, Escuela Politecnica Superior, University of Seville. E-41011 Seville,Spain.
2.Department of Analytical Chemistry, Faculty of Pharmacy, University of Seville, E-41012 Seville, Spain.

Citation : Julia Martin,et.al., A Bilogarithmic Hyperboline Sine Procedure for the Simultaneous Calculation of Successive Formation Constants of Two Step Overlapping Acid-Base Equilibria from Potentiometric MeasurementsInternational Journal of Advanced Research in Chemical Science 2018, 5(11) : 43-50.

Abstract

In this paper we have developed a procedure for the potentiometric determination of acidity constants of simultaneous acid-base equilibria. The V-pH data are transformed into data n-pH, being n the Bjerrum index. The process of linearization involving the use of the hyperbolic sine function leads to a bilogarithmic expression. The procedure has been applied to the experimental data obtained by us in the laboratory for succinic acid, obtaining good results.

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