Non-ideal properties of the TRIS—TRIS·HCl−NaCl−H2O buffer system in the 0–40 °C temperature interval. Application of the pitzer equations
The buffer solution TRIS—TRIS·HCl−NaCl−H2O was studied in the 0–40 °C temperature region and ionic strength interval of (0.1–4)m (m is molality) by the e.m.f. method using two types of cells without liquid junction composed of platinum-hydrogen, silverchloride, and sodium-glass electrodes. For temperatures of 5 and 15 °C and the (1–4)m concentration region, the osmotic coefficients of the TRIS·HCl−H2O solutions were measured by the isopiestic method. The results were processed in the framework of the Pitzer method, and the parameters of interaction of the components of the buffer system were calculated. The associative character of the interactions in the TRIS·HCl−H2O solution was shown.
Key wordsacid-base equilibrium Pitzer method activity coefficients of TRIS—TRIS·HCl−NaCl osmotic coefficient
Unable to display preview. Download preview PDF.
- 1.K. S. Pitzer,Report to a Group at the National Institute of Standards and Technology (December, 1988), 1988.Google Scholar
- 6.P. Ya. Tishchenko,Zh. Fiz. Khim., 1998,72, 1059 [Russ. J. Phys. Chem., 1998,72 (Engl. Transl.)].Google Scholar
- 9.K. S. Pitzer,Ion Interaction Approach: Theory and Data Correlation, inActivity Coefficients in Electrolyte Solutions, 2nd Ed., CRC Press, Boca Raton, Ann Arbor, Boston, London, 1991, p. 75.Google Scholar
- 11.R. G. Bates and H. B. Hetzer,J. Phys. Chem., 1961,65, 667.Google Scholar
- 13.S. P. Datta, A. K. Grzybowski, and B. A. Weston,J. Chem. Soc.,1963, 792.Google Scholar
- 14.D. J. G. Ives and G. J. Janz, inReference Electrodes. Academic Press, New York-London, 1961, p. 189.Google Scholar