期刊
JOURNAL OF CHEMICAL AND ENGINEERING DATA
卷 66, 期 1, 页码 437-455出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jced.0c00744
关键词
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资金
- Helmholtz Association
- Natural Environment Council of the UK under the joint NERC/NSF:GEO scheme [NE/P012361/1]
- Engineering and Physical Sciences Research Council [EP/N025245/1]
- SCOR
- International Association for the Properties of Water and Steam
- International Association for the Physical Sciences of the Oceans
- U.S. National Science Foundation [OCE-1840868]
- EPSRC [EP/N025245/1] Funding Source: UKRI
- NERC [NE/P012361/1] Funding Source: UKRI
Experimental measurements were conducted to determine the solubilities of Tris in various aqueous solutions and to compare the results to literature data. The interactions of Tris with ions at 25 degrees Celsius were determined and stoichiometric dissociation constants of TrisH(+) in aqueous NaCl were calculated.
The substance Tris (or TRAM, 2-amino-2-hydroxymethyl-1,3-propanediol) is used in the preparation of pH buffer solutions for applications in natural water chemistry, including seawater. The development of a chemical speciation model of buffer solutions containing Tris, TrisH(+), and the major ions of seawater is desirable, so that the effects of changes in the composition and concentration of the medium on pH can be calculated. The Pitzer activity coefficient equations, commonly used in such speciation models, describe the thermodynamic properties of solutions in terms of interactions between dissolved ions and uncharged solute species. To determine some of these interactions, we have measured solubilities of Tris((s)) in water and aqueous solutions of NaCI, TrisHC(+), and (TrisH)(2)SO4 and the solubility of NaCl(s) in aqueous Tris((aq)), from 5 to 45 degrees C. We report measurements of the water activities of Tris solutions at 293.5 K to high supersaturation with respect to the solid. Using the Pitzer equations, we compare our results to literature data yielding stoichiometric dissociation constants of TrisH(+) in aqueous NaCI, and to electromotive forces of cells containing dissolved Tris, TrisHCl, and NaCI. Values of parameters for the interactions of Tris with the ions TrisH(+), Nat, and SO42- at 25 degrees C are determined.
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