Thermodynamic Quantities for the Ionization Reactions of Buffers

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248 GOLDBERG, KISHORE, AND LENNEN Values adjusted to TÄ298.15 K and IÄ0 pK rH°/(kJ mol 1 ) rC p /(J K 1 mol 1 ) Reference 9.138 43.19 61 97ROY/CAR 9.32 98AZA/ORA Comments: The results of Roy et al. 97ROY/CAR which used an electrochemical cell without liquid junction are judged to be the most reliable. TABLE 7.9. Arsenate Other names arsenic acid; orthoarsenic acid; CAS No. 7778-39-4 Empirical formula AsH 3O 4 Molecular weight 141.94 Ionization Reactions Evaluation: reaction 1: CC; reaction 2: CC; reaction 3: CC Structure: J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002 H 3AsO 4H H 2AsO 4 H 2AsO 4 H HAsO4 2 HAsO 4 2 H AsO4 3 Selected values at TÄ298.15 K and IÄ0: pK2.31, rG°/(kJ mol 1 )13.19, and rH°/(kJ mol 1 )7.8 pK7.05, rG°/(kJ mol 1 )40.24, and rH°/(kJ mol 1 )1.7 pK11.9, rG°/(kJ mol 1 )67.93, and rH°/(kJ mol 1 )15.9
Values from literature pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference Reaction „1…: H 3AsO 4ÄH ¿ ¿H 2AsO 4 À 2.30 298.15 ? Conductivity. 07LUT 2.36 298.15 0 Conductivity. 13WAS/STR 2.25 291.15 ? Potentiometric titration—glass electrode. 34BRI/JAC 2.094 2.114 273.15 278.15 0 0 Electrochemical cell. The value of rH° given here was calculated from pKs measured at several temperatures. 53AGA/AGA 2.138 283.15 0 2.163 288.15 0 2.194 293.15 0 2.223 2.2 298.15 0 2.265 303.15 0 2.296 308.15 0 2.332 313.15 0 2.383 318.15 0 2.420 323.15 0 2.65 293.15 ? Glass electrode. 59CHU 2.49 283.15 0 Potentiometric titration—glass electrode. The approximate value of 59FLI/MIS 2.19 3 298.15 0 1.95 308.15 0 2.15 323.15 0 rH° given here was calculated from pKs measured at several temperatures. 2.301 298.15 0 Glass electrode. 64SAL/SCH 7.07 298.15 0.2 M Calorimetry. 64SEL/SUN 2.32 298.15 3.0 M Potentiometric titration—glass electrode; spectrophotometry. The reported value is approximate. 70SEC/IND 2.26 298.15 0.1 M 76TOS 2.128 298.15 1.0 M Potentiometric titration—glass electrode. 88KHO/ROB À ¿ 2À Reaction„2…: H2AsO4 ÄH ¿HAsO4 4.40 298.15 ? Conductivity. 20BLA 6.80 298.15 ? Kinetic data. 27SKR/ZAH 7.08 298.15 ? Glass electrode. 28HUG 6.77 291.15 ? Potentiometric titration—glass electrode. 34BRI/JAC 7.054 7.032 273.15 278.15 0 0 Electrochemical cell. The value of rH° given here was calculated from pKs measured at several temperatures. 53AGA/AGA 7.015 283.15 0 6.999 288.15 0 6.990 293.15 0 6.980 0.15 298.15 0 6.974 303.15 0 6.973 308.15 0 6.973 313.15 0 6.973 318.15 0 6.980 323.15 0 6.39 298.15 1.0 M Glass electrode. 58MAD 5.89 293.15 ? Glass electrode. 59CHU 7.05 283.15 0 Potentiometric titration—glass electrode. The approximate value of 59FLI/MIS 6.94 0.7 298.15 0 6.90 308.15 0 6.79 323.15 0 IONIZATION REACTIONS OF BUFFERS rH° given here was calculated from pKs measured at several temperatures. 3.22 298.15 0.2 M Calorimetry. 64SEL/SUN 6.10 277.95 1.0 M Potentiometric titration—glass electrode. 71BEE/LIN 5.75 295.15 0.1 M Potentiometric titration—glass electrode. 73BEE/LAW 6.76 298.15 0.1 M 76TOS 7.09 298.15 0 Potentiometric titration—glass electrode. 76WAU 6.47 298.15 1.0 M Glass electrode. 86GRE/TRA 9.21 298.15 ? 2À ¿ 3À Reaction„3…: HAsO4 ÄH ¿AsO4 Conductivity. 20BLA 11.53 291.15 ? Potentiometric titration—glass electrode. 34BRI/JAC 11.34 283.15 0 Potentiometric titration—glass electrode. The approximate value of 59FLI/MIS 11.48 11.66 0.9 298.15 308.15 0 0 rH° given here was calculated from pKs measured at several temperatures. 11.91 323.15 0 11.52 293.15 ? Glass electrode. 59CHU 18.20 0.2 M Calorimetry. 64SEL/SUN 11.29 298.15 0.1 M 76TOS 249 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 17: Values adjusted to TÄ298.15 K and
Page 21 and 22: 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 35 and 36: Values from literature pK rH°/(kJ
Page 39 and 40: Values from literature pK rH°/(kJ
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-
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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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