Thermodynamic Quantities for the Ionization Reactions of Buffers

254 GOLDBERG, KISHORE, AND LENNEN
Values from literature—Continued
pK rH°/(kJ mol 1 ) T/K I Methods and comments Reference
7.492 278.15 0 Electrochemical cell—no liquid junction. The value of rH° given
7.416 283.15 0
7.333 288.15 0
7.257 293.15 0
7.187 24.39 298.15 0
7.115 303.15 0
7.049 308.15 0
6.982 313.15 0
6.915 318.15 0
6.856 323.15 0
here was calculated from pKs measured at several temperatures. The
value rC p /(J K 1 mol 1 )4 was also calculated from the
temperature dependency of their 76VEG/BAT reported pKs.
7.494 278.15 0 Electrochemical cell—no liquid junction. The value of rH° given
7.410 283.15 0
7.331 288.15 0
7.256 293.15 0
7.187 24.18 298.15 0
7.118 303.15 0
7.050 308.15 0
7.023 310.15 0
6.985 313.15 0
6.920 318.15 0
6.858 323.15 0
6.800 328.15 0
here was calculated from pKs measured at several temperatures. The
value rC p /(J K 1 mol 1 )4 was also calculated from the
temperature dependency of their 77ROY/GIB reported pKs.
76VEG/BAT
77ROY/GIB
7.16 298.15 0.012 M Potentiometric titration of sample 0.01–0.014 M with 0.1 M HCl
or 0.1 M NaOH.
87KIT/ITO
7.16 298.15 0.00602 M Based on measurement of ionic mobilities. 87POS/DEM
25.67 288.15 0.16 M
1 1 Calorimetry. rC p/(J K mol )4 was also calculated from the
temperature dependency of their 93ROI/BAC reported pKs.
93ROI/BAC
25.78 298.15 0.16 M
25.76 310.15 0.16 M
24.41 298.15 0.01 M
25.39 298.15 0.11 M
25.72 298.15 0.16 M
23.9 298.15 0
7.06 25.17 298.15 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.
J. Phys. Chem. Ref. Data, Vol. 31, No. 2, 2002
98FUK/TAK