Non-ideal properties of the TRIS—TRIS·HCl−NaCl−H2O buffer system in the 0–40 °C temperature interval. Application of the pitzer equations
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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
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