Thermodynamic Quantities for the Ionization Reactions of Buffers

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274 GOLDBERG, KISHORE, AND LENNEN Values adjusted to TÄ298.15 K and IÄ0—Continued pK rH°/(kJ mol 1 ) rC p /(J K 1 mol 1 ) Reference 3.05 0.84 80CAL/RIZ 3.14 81NAP/PAO 2.73 83DUB/BEW 3.03 84MOT/MAR2 3.06 85CAP/DER 2.97 4 85DAN/DER 3.05 1.2 182 90DER/DES Reaction „2…: HL À ÄH ¿ ¿L 2À 4.45 57TIC/BEN 4.35 60YAS/YAM 4.55 61CAM/OST 4.54 63GRE/TOB 4.55 1.9 69GRE/HAN 4.86 72APL/NOI 4.55 6.1 72GRE/OTS 5.5 138 72GRE/OTS2 4.44 72NAP 4.55 73CAS/DIB 4.35 74MIY/SHI 4.38 75FIE/COB 4.32 78ARE/MUS 4.37 79HOG/NIL 4.43 79SIN/DUB 4.37 7.8 80CAL/RIZ 4.44 81NAP/PAO 4.15 83DUB/BEW 4.37 84MOT/MAR2 4.37 85CAP/DER 4.36 11 85DAN/DER 4.36 9.3 97 90DER/DES Comments: We adopt the values pK 13.05 and pK 24.37 based on the results of three careful studies 80CAL/RIZ, 85CAP/DER, 90DER/DES where the pKs were adjusted to I0. The average of all studies leads to pK 13.07 and pK 24.43. For reaction 1, we adopt the average of all of the rH° values excepting the approximate result of Daniele et al. 85DAN/DER. For reaction 2, we adopt the average of all of the rH° values excepting the approximate result of Daniele et al. 85DAN/DER and the somewhat discordant result of Grenthe and Hansson 69GRE/HAN. The values of rC p are based on the results of Grenthe and Ots 72GRE/OTS2. J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002
TABLE 7.26. 3,3-Dimethylglutarate Other names 3,3-dimethylglutaric acid; ,-dimethylglutaric acid; 3,3-dimethylpentanedioic acid; 2,2-dimethylpropane-1,3-dicarboxylic acid; CAS No. 4839-46-7 Empirical formula C 7H 12O 4 Molecular weight 160.17 Ionization reactions Evaluation: reaction 1, B; reaction 2, B Structure: IONIZATION REACTIONS OF BUFFERS H 2LH HL (1) HL H L 2 (2) where H 2LC 7H 12O 4 Selected values at TÄ298.15 K and IÄ0: pK3.70 and rG°/(kJ mol 1 )21.12 for reaction 1 pK6.34 and rG°/(kJ mol 1 )36.19 for reaction 2 Values from literature pK T/K I Methods and comments Reference Reaction „1…: H 2LÄH ¿ ¿HL À 3.70 298.15 0 Potentiometric. 31GAN/ING 3.70 298.15 0 Electrochemical cell—no liquid junction. 36JON/SOP 4.89 323.15 0 4.03 347.15 0 3.75 298.15 0.012 M titration of 0.01–0.014 M sample with 0.1 M HCl or NaOH 87KIT/ITO Reaction „2…: HL À ÄH ¿ ¿L 2À 6.29 298.15 0 Potentiometric. 31GAN/ING 6.34 298.15 0 Electrochemical cell—no liquid junction. 36JON/SOP 6.49 323.15 0 6.60 347.15 0 6.35 298.15 0.012 M titration of 0.01–0.014 M sample with 0.1 M HCl or NaOH 87KIT/ITO Values adjusted to TÄ298.15 K and IÄ0 pK Reference Reaction „1…: H 2LÄH ¿ ¿HL À 3.70 31GAN/ING 3.70 36JON/SOP 3.85 87KIT/ITO Reaction „2…: HL À ÄH ¿ ¿L 2À 6.29 31GAN/ING 6.34 36JON/SOP 6.54 87KIT/ITO Comments: The results of Jones and Soper 36JON/SOP are judged to be the most reliable. They are in reasonable accord with the results of the other two studies in the literature. 275 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 31 and 32: TABLE 7.17. Cacodylate Other names
Page 33 and 34: Values from literature—Continued
Page 43: Values from literature—Continued
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
Page 79 and 80: TABLE 7.44. MES Other names 2-N-mor
Page 85 and 86: TABLE 7.49. MOPSO Other names 3-N-m
Page 91 and 92: TABLE 7.51. Phosphate Other names p
Page 95 and 96:
IONIZATION REACTIONS OF BUFFERS Val
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Values from literature pK rH°/(kJ
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Values adjusted to TÄ298.15 K and
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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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