Thermodynamic Quantities for the Ionization Reactions of Buffers

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252 GOLDBERG, KISHORE, AND LENNEN Values from literature pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference Reaction „1…: H 2LÄH ¿ ¿HL À 7.43 298.15 0.016 M Conductivity. 06WOO 7.8 298.15 0.07 M Approximate value obtained from reported potentiometric titration data 40KRA. 30MIC 7.9 291.15 0.04 M Potentiometric titration. 31BRI/ROB 7.89 298.15 ? Electrochemical cell with liquid junction. 37BUS 7.91 298.15 0 Electrochemical cell with liquid junction. 40KRA 8.3971 273.15 0 Electrochemical cell—no liquid junction. The pK values given here 52MAN/SCH 8.3040 278.15 0 were those obtained by using Ag,AgI electrodes. Values of pK very 8.2171 283.15 0 close pK0.0010 to these were obtained by use of Ag,AgCl 8.1367 8.0592 7.9798 24.25 288.15 293.15 298.15 0 0 0 electrodes. The value of rH° given here was calculated from pKs 1 1 measured at several temperatures. The value rC p/(J K mol ) 135 was also calculated from the temperature dependency of 7.9092 303.15 0 their 52MAN/SCH reported pKs. 7.8471 308.15 0 7.8226 310.15 0 7.7858 313.15 0 7.7290 318.15 0 7.6776 323.15 0 7.6264 328.15 0 7.5762 333.15 0 7.971 298.15 0 Spectrophotometry. 56BIG 8.00 298.15 0 Potentiometric titration—glass electrode; Spectrophotometry. 59NAS/HEI 24.31 298.15 0 Calorimetry. 65MIL/AHL 8.169 8.093 288.15 293.15 0 0 Spectrophotometry. The value of rH° given here was calculated from pKs measured at several temperatures. The value 69BRI/SAW 8.019 7.950 24.24 298.15 303.15 0 0 1 1 rC p/(J K mol )134 was also calculated from temperature dependency of their 69BRI/SAW reported pKs. the 7.878 308.15 0 7.806 313.15 0 7.738 318.15 0 7.675 323.15 0 7.98 298.15 0 Potentiometric titration—glass electrode. 80MCK 7.55 310.15 0.15 M Potentiometry. The ‘‘practical’’ pK value of Cowden et al. 82COW/ JAC was adjusted to obtain the pK value given here. 82COW/JAC 7.97 298.15 0.012 M Potentiometric titration of sample 0.01–0.014 M with 0.1 M HCl or 0.1 M NaOH. 87KIT/ITO Reaction„2…: HL À ÄH ¿ ¿L 2À 12.31 311.15 0.1 M Spectrophotometry; glass electrode. 55BUT/RUT 12.8 298.15 0 Potentiometric titration—glass electrode; Spectrophotometry. 59NAS/HEI J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002
Values adjusted to TÄ298.15 K and IÄ0 pK rH°/(kJ mol 1 ) rC p /(J K 1 mol 1 ) Reference Reaction „1…: H 2LÄH ¿ ¿HL À 7.5 06WOO 8.0 30MIC 7.95 31BRI/ROB 8.1 37BUS 7.91 40KRA 7.980 24.25 135 52MAN/SCH 7.97 56BIG 8.00 59NAS/HEI 24.31 65MIL/AHL 8.019 24.24 134 69BRI/SAW 7.98 80MCK 7.96 82COW/JAC 8.07 87KIT/ITO Reaction „2…: HL À ÄH ¿ ¿L 2À 12.7 55BUT/RUT 12.8 59NAS/HEI Comments: The pK values determined by Manov et al. 52MAN/SCH are judged to be the most reliable and their 52MAN/SCH value of pK 1 at T 298.15 K has been selected. Several other studies 30MIC, 31BRI/ROB, 56BIG, 59NAS/HEI, 69BRI/SAW, 80MCK are also in good agreement with the results of Manov et al. 52MAN/SCH. We adopt the average value rH°/(kJ mol 1 )24.27 for reaction 1. TABLE 7.11. BES Other names N,N-bis2-hydroxyethyl-2-aminoethanesulfonic acid; CAS No. 10191-18-1 Empirical formula C 6H 15NO 5S Molecular weight 213.25 Ionization reaction Evaluation: AAA Structure: IONIZATION REACTIONS OF BUFFERS HL H L , where HLC 6H 15NO 5S Selected values at TÄ298.15 K and IÄ0: pK7.187, rG°/(kJ mol 1 )41.024, rH°/(kJ mol 1 )24.25, and rC p /(J K 1 mol 1 )2 Values from literature pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference 7.5 273.15 0.1 M Potentiometric titration—glass electrode. 66GOO/WIN 7.20 293.15 0.01 M 7.17 293.15 0.1 M 7.18 293.15 0.2 M 6.90 310.15 0.1 M 6.92 23.1 298.15 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 253 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: TABLE 7.10. Barbital Other names ba
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 73 and 74:
IONIZATION REACTIONS OF BUFFERS Val
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TABLE 7.42. Maleate Other names mal
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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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