Activity coefficients of potassium chloride in aqueous solutions of

potassium chloride and potassium phthalate

 A. Marques,* M.I.A. Ferra, M.H. Bandeira

Dep. Química, Univ. Beira-Interior, 6201-001 Covilhã, Portugal

Abstract

Mean activity coefficients of potassium chloride were determined in aqueous solutions of potassium chloride and potassium phthalate, in the temperature range 10-50 ºC and ionic strength range 0.05-4 mol kg^-1, from potentiometric measurements on a galvanic cell without liquid junction. By processing the results using the Pitzer model, interaction parameters for potassium phthalate were calculated as well as their temperature dependence.

Keywords: activity coefficients, potassium phthalate, Pitzer equations.

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References

1. R.P. Buck, S. Rondinini, A.K. Covington, F.G.K. Baucke, C.M.A. Brett, M.F. Camões, M.J.T. Milton, T. Mussini, R. Naumann, K.W. Pratt, P. Spitzer, G.S. Wilson, Pure Appl. Chem. 74, 11 (2002) 2169-2200.        [ Links ]

2. R.G. Bates, E.A. Guggenheim, Pure Appl. Chem. 1 (1960) 163.

3. K.S. Pitzer, J. Phys. Chem. 77 (1973) 268.

4. A.K. Covington, M.I.A. Ferra, J. Sol. Chem. 23 (1994) 1.

5. K.S. Pitzer, “Ion Interaction Approach: Theory and Data Correlation”, in Activity Coefficients in Electrolyte Solutions, 2^nd ed., K.S. Pitzer, Ed., CRC Press, Boca Raton, Florida, U. S. A. 1991.

6. R.G. Bates, Determination of pH. Theory and Pratctice, 2^nd ed., John Wiley & Sons, Inc., New York, U. S. A., 1973.

7. R.A. Robinson, R.H. Stokes, Electrolyte Solutions, 2.^nd. ed., (revised), Butterworth & Co, London, 1970.

8. C.Y. Chan, Y.W. Eng, K.S. Eu, J. Chem. Eng. Data 40 (1995) 685.

9. J.I. Partanen, P.O. Minkkinen, J. Chem. Eng. Data 42 (1997) 805.

10. W.J. Hamer, G.D. Pinching, S.F. Acree, J. Res. Natl. Bur. Stand. 35 (1945) 539.

11. W.J. Hamer, S.F. Acree, J. Res. Natl. Bur. Stand. 35 (1945) 381.

12. A.J.G. Mendonça, P.M. Juusola, Fluid Phase Equilibria 231 (2005) 114.

*Corresponding author. E-mail address: ammmba@ubi.pt