Thermodynamic Quantities for the Ionization Reactions of Buffers

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256 GOLDBERG, KISHORE, AND LENNEN Values from literature—Continued pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference 8.7536 273.15 0 Electrochemical cell—no liquid junction. The value of rH° given 8.6637 278.15 0 8.5769 283.15 0 8.4930 288.15 0 8.4119 293.15 0 8.3335 26.27 298.15 0 8.2576 303.15 0 8.1840 308.15 0 8.1552 310.15 0 8.1127 313.15 0 8.0436 318.15 0 7.9766 323.15 0 7.9115 328.15 0 here was calculated from pKs measured at several temperatures. The value rC p /(J K 1 mol 1 )5 was also calculated from the temperature dependency of their 64DAT/GRZ reported pKs. 64DAT/GRZ 8.41 293.15 0.1 M Potentiometric titration—glass electrode. 64JOK/MAJ 8.7 273.15 0.1 M Potentiometric titration—glass electrode. 66GOO/WIN 8.4 293.15 0.01 M 8.35 293.15 0.1 M 8.3 293.15 0.2 M 8.2 310.15 0.1 M 8.14 293.15 0.1 M Spectrophotometry. 67KAR/SPR 8.29 293.15 0.02 M Potentiometric titration—glass electrode; spectrophotometry. 68KOS/ROM 8.31 26.2 298.15 0.01 M Potentiometric titration—glass electrode; and calorimetry. Dilute solutions 0.005–0.01 M were titrated with 0.1 M NaOH or 0.1 M HCl. 76MCG/JOR 8.39 298.15 0.1 M Potentiometric titration—glass electrode. 83NAK/KRI 8.00 303.15 0.1 M Potentiometric titration—glass electrode. 84GHO 8.093 298.15 0.10 M Potentiometric titration—glass electrode. 84MOT/MAR 8.34 298.15 1.0 M Potentiometric titration—glass electrode. 86AND 8.30 298.15 0.012 M Potentiometric titration of sample 0.01–0.014 M with 0.1 M HCl or 0.1 M NaOH. 87KIT/ITO 8.14 298.15 0.1 M Potentiometric titration—glass electrode. 91DUM/MAR 8.39 298.15 0.10 M Potentiometric titration—glass electrode. 91KRI/NAK 8.22 298.15 0.2 M Potentiometric titration—glass electrode. 92COR/SON 8.22 27.05 298.15 0.1 M Electrochemical cell with liquid junction; calorimetry. Fukada and Takahashi 98FUK/TAK also obtained rC p /(J K 1 mol 1 )2 at I0.1 M from the temperature dependence of rH° over the range 278.15–323.15 K. Values adjusted to TÄ298.15 K and IÄ0 98FUK/TAK pK rH°/(kJ mol 1 ) rC p /(J K 1 mol 1 ) Reference Reaction „1…: H 2L ¿ ÄH ¿ ¿HL Á 2.50 55TOR/KOL 1.96 64JOK/MAJ 1.65 67KAR/SPR 2.51 84GHO 1.66 84MOT/MAR 2.23 9.4 89ELH/SAD 1.70 91DUM/MAR 1.78 91KRI/NAK 1.95 92COR/SON Reaction„2…: HL Á ÄH ¿ ¿L À 8.37 53CHA/COU 8.45 55TOR/KOL 8.334 26.27 5 64DAT/GRZ 8.54 64JOK/MAJ 8.49 66GOO/WIN 8.27 67KAR/SPR 8.33 68KOS/ROM 8.40 76MCG/JOR 8.60 83NAK/KRI 8.29 84GHO 8.31 84MOT/MAR J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002
Values adjusted to TÄ298.15 K and IÄ0—Continued pK rH°/(kJ mol 1 ) rC p /(J K 1 mol 1 ) Reference 8.73 86AND 8.39 87KIT/ITO 8.35 91DUM/MAR 8.60 91KRI/NAK 8.49 92COR/SON 8.43 26.4 6 98FUK/TAK Comments: The results for reaction 1 are very scattered and we have adopted the rounded average of the pK values. For reaction 2, the results of Datta et al. 64DAT/GRZ, which were obtained by using an electrochemical cell with no liquid junction, are judged to be the most reliable for the pK value. We have adopted the respective averages of the reported rH° and rC p values for reaction 2. TABLE 7.13. Bis-tris Other names bis2-hydroxyethyliminotrishydroxymethylmethane; 2-bis2-hydroxyethylamino-2-hydroxymethyl-1,3-propanediol; 2,2-bishydroxymethyl-2,2,2-nitrilotriethanol; bis2-hydroxyethylaminotrishydroxymethylmethane; CAS No. 6976-37-0 Empirical formula C 8H 19NO 5 Molecular weight 209.24 Ionization reaction Evaluation: AAA Structure: H 3L H H 2L , where H 2LC 8H 19NO 5 Selected values at TÄ298.15 K and IÄ0: pK6.484, rG°/(kJ mol 1 )37.011, rH°/(kJ mol 1 )28.4, and rC p /(J K 1 mol 1 )27 Values from literature pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference 6.46 298.15 0 Potentiometric titration—glass electrode. Lewis 66LEW stated that the results have been corrected for ionic strength—presumably to I 0. 6.9314 273.15 0 Electrochemical cell—no liquid junction. The value of rH° given 6.8344 278.15 0 6.7429 283.15 0 6.6536 288.15 0 6.5665 293.15 0 6.4835 28.24 298.15 0 6.4013 303.15 0 6.3212 308.15 0 6.2441 313.15 0 6.1690 318.15 0 6.0959 323.15 0 IONIZATION REACTIONS OF BUFFERS here was calculated from pKs measured at several temperatures. The value rC p /(J K 1 mol 1 )24 was also calculated from the temperature dependency of their 70PAA/BAT reported pKs. 66LEW 70PAA/BAT 6.41 29.2 298.15 0.01 M Potentiometric titration—glass electrode; and calorimetry. Dilute solutions 0.005–0.01 M were titrated with 0.1 M NaOH or 0.1 M HCl. 76MCG/JOR 6.41 298.15 0 Potentiometric titration—glass electrode. Values of pKs were 80SCH/ABE 6.74 298.15 1.0 M extrapolated to I0. Potentiometric titration—glass electrode. 82SIG/SCH 6.50 298.15 0.012 M Potentiometric titration of sample 0.01–0.014 M with 0.1 M HCl or 0.1 M NaOH. 87KIT/ITO 6.481 28.5 298.15 0 Electrochemical cell—with a liquid junction. The value rC p /(J K 1 mol 1 )22 was also calculated from the temperature dependency of their 89WES/PAL reported pKs. 257 89WES/PAL J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002
Page 1 and 2: Thermodynamic Quantities for the Io
Page 3 and 4: 2. Thermodynamic Background Of prim
Page 5 and 6: cal cells both with and without liq
Page 7 and 8: 7. Tables of Thermodynamic Quantiti
Page 9 and 10: IONIZATION REACTIONS OF BUFFERS Val
Page 11 and 12: TABLE 7.3. ADA Other names N-2-acet
Page 13 and 14: TABLE 7.4. 2-Amino-2-methyl-1,3-pro
Page 15 and 16: Values adjusted to TÄ298.15 K and
Page 19 and 20: Values from literature pK rH°/(kJ
Page 21 and 22: TABLE 7.10. Barbital Other names ba
Page 25: Values adjusted to TÄ298.15 K and
Page 31 and 32: TABLE 7.17. Cacodylate Other names
Page 33 and 34: Values from literature—Continued
Page 45 and 46: TABLE 7.26. 3,3-Dimethylglutarate O
Page 47 and 48: TABLE 7.28. Ethanolamine Other name
Page 57 and 58: TABLE 7.33. Glycylglycine Other nam
Page 65 and 66: TABLE 7.38. HEPPSO Other names N-2-
Page 75 and 76: TABLE 7.42. Maleate Other names mal
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IONIZATION REACTIONS OF BUFFERS Val
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TABLE 7.44. MES Other names 2-N-mor
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Values adjusted to TÄ298.15 K and
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TABLE 7.49. MOPSO Other names 3-N-m
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Values from literature—Continued
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TABLE 7.51. Phosphate Other names p
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Values from literature—Continued
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Values from literature pK rH°/(kJ
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TABLE 7.55. POPSO Other names piper
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TABLE 7.60. TABS Other names N-tris
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TABLE 7.68. Tris Other names 2-amin
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IONIZATION REACTIONS OF BUFFERS 8.
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IONIZATION REACTIONS OF BUFFERS 27C
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IONIZATION REACTIONS OF BUFFERS 57N
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IONIZATION REACTIONS OF BUFFERS 68V
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IONIZATION REACTIONS OF BUFFERS 76W
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IONIZATION REACTIONS OF BUFFERS 90D
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Thermodynamic Quantities for the Ionization Reactions of Buffers

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