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Licensed Unlicensed Requires Authentication Published by De Gruyter 2016 (Print 1997)

Consistency of pH Standard Values With the Corresponding Thermodynamic Acid Dissociation Constants

(Technical Report)

  • M. Filomena Camoes , M. J. Guiomar Lito , M. Isabel A. Ferra and Arthur K. Covington

Abstract

With the simplest possible assumptions on the ion activity coefficients, namely a Debye-Hückel approach, pH values of eleven standard buffer solutions have been calculated from the corresponding thermodynamic acidity constants, K(I→0), and compared to the electrometrically assigned pH(S) values (by Harned cell method). Agreement is within ±0.01 in the temperature range 10–40°C for all standards, except carbonate. The results for the phthalate, acetate, phosphate and carbonate systems at 25°C indicate that this consistency is improved if specific ion interactions are taken into account, according to the Pitzer theory.

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