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Dissociation Constant of N-(2-Acetamido)-Iminodiacetic Acid Monosodium (ADA) from (278.15 to 328.15) K

Open Journal of Physical Chemistry 2014年第2期4卷 73-79页

作者： Rabindra N. Roy Lakshmi N. Roy John J. Dinga Mathew R. Medcalf Katherine E. Hundley Eric B. Hines Clark B. Summers Lucas S. Tebbe jamie veliz Drury University Springfield USA

The acidic dissociation constant of N-(2-acetamido)-iminodiacetic acid monosodium (ADA) has been determined at 12 temperatures from 278.15 to 328.15 K by electromotive-force (emf) measurements of hydrogen-silver chloride cells without liquid junction. At 298.15 K, the value of the dissociation constant (pK2) is 6.8416 ± 0.0004. In response to the need for new physiological pH standards, buffer solutions of NaADA and its disodium salt, Na2ADA would be useful for pH control in the biological region of pH 6.5 to 7.5. The pK2 values over the experimental temperature range are given as a function of the thermodynamic temperature (T) by the equation pK2 = 2943.784/T - 47.05762 + 7.72703 ln T. At 298.15 K, standard thermodynamic quantities for the dissociation process have been derived from the temperature coefficients;ΔH° = 12,252 J·mol-1, ΔS° = -89.9 J·K-1·mol-1 and = -148 J·K-1·mol-1. The results are interpreted and compared with those of structurally related derivatives of GLYCINE.

关键词： Dissociation Constant ADA Emf Buffer Thermodynamic Quantity

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Thermodynamics of the Second Stage Dissociation Step (pK<sub>2</sub>) of Buffer Monosodium 1,4-Piperazinediethanesulfonate from (278.15 to 328.15) K

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Journal of Biophysical Chemistry 2014年第3期5卷 91-98页

作者： Rabindra N. Roy Lakshmi N. Roy John J. Dinga Matthew R. Medcalf Katherine E. Hundley Eric B. Hines Ryan R. Parmar jamie A. veliz Clark B. Summers Lucas S. Tebbe Hoffman Department of Chemistry Drury University Springfield USA

Values of the second thermodynamic dissociation constant pK2 of the protonated form of monosodium 1,4-piperazinediethanesulfonate (PIPES) have been determined at twelve different temperatures in the temperature range from (278.15 to 328.15) K including the body temperature 310.15 K by measurement of the electromotive-force for cells without liquid junction of the type: Pt (s), H2 (g), 101.325 kPa|Na-PIPES (m1) + Na 2-PIPES (m2) + NaCl (m3)|AgCl (s), Ag (s), where m1, m2 and m3 indicate the molalities of the corresponding species at 1 atm = 101.325 kPa in SI units. The pK2 values for the dissociation of Na-PIPES are represented by the equation: pK2 = -1303.76/T + 48.369 - 6.46889 lnT with an uncertainty of ± 0.001. The values of pK2 for Na-PIPES were found to be 7.1399 ± 0.0004 at 298.15 K and 7.0512 ± 0.0004 at 310.15 K, respectively, and indicate that this buffer would be useful as pH standard in the range of physiological application. Standard thermodynamic quantities for the acidic dissociation process of Na-PIPES have been derived from the temperature coefficients of the pK2. These values are compared with those of structurally related N-substituted PIPERAZINE and TAURINE at 298.15 K.

关键词： Dissociation Constant Zwitterion Ionic Strength pK2 Buffer Compound e.m.f Thermodynamic Quantities

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