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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.
QuelleSource
- Pure and Applied Chemistry
- 69
- De Gruyter | 1997