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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 11 Issue 3 (2006) pp 150-161

On the Existence and Uniqueness of the Equilibrium of Arbitrary Brønsted Acid–Base Mixtures

Guido Frison* and Alberto Calatroni

ISISS Daverio, Varese, Italy, and Politecnico of Milan, Italy
Received Jan 19, 2005. Accepted March 7, 2005.

Published online: 25 May 2006

Abstract. Because the calculation of the pH of arbitrary mixtures necessarily requires the application either of the proton-balance equation or of the charge-balance law, it may be rationalized by introducing the proton function, HF. The present article demonstrates that the HF of any Brønsted acid–base ideal mixture in aqueous medium is a monotonic decreasing function in the pH interval [–1, 14] and that there is only one equilibrium condition.

Key Words: In the Classroom; analytic chemistry; physical chemistry; pH

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Issue date: June 1, 2006

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