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Molecular Thermodynamics of Fluid-Phase Equilibria, Third Edition by Edmundo Gomes de Azevedo - Institute Superior Técnico, Lisbon, Rüdiger N. Lichtenthaler - University of Heidelberg, John M. Prausnitz - University of California, Berkeley

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Appendix I The Ion-Interaction Model of Pitzer for Multielectrolyte Solutions

Section 9.14 gives a brief discussion of the ion-interaction model of Pitzer and expressions for the activity coefficient and the osmotic coefficient of binary (single-electrolyte) solutions. This Appendix gives the genera! expressions for these coefficients for multielectrolyte solutions. Also given are tables that list the ion-interaction parameters and their temperature dependence for several common aqueous electrolytes.

For an electrolyte solution containing ws kg of solvent s and solutes i, j,… with molalities mi, mj,…, Pitzer (1995) assumed that the excess Gibbs energy is

(I-1)1

1 Equation (1-1) is the same as Eq. (9-58).

Function f(I) depends on ionic strength ...

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