204
F. Millero . D. Pierrot
Table 8.2. Activity coefficients of some ions at different temperatures (Millero and Pierrot 1998)
Ion
H+
Li+
Na+
K+
Rb+
O·C
0.687
0.737
0.625
0.590
0.583
Cs+
0.531
NH;
0.588
MgOH+ 0.918
Mg2+
ci+
5r 2 +
F
CI
BrOH
H5
NO;
NO~
HCO~
HSO~
H50~
B(OH)~
HlO~
H2AsO~
Acetate
0.222
0.203
0.203
0.313
0.684
0.709
0.753
0.312
0.691
0.660
0.604
0.592
1.062
0.818
0.386
0.537
0.819
0.672
0.120
0.161
0.052
0.060
0.113
5 ·C
0.664
0.733
0.630
0.592
0.586
0.535
0.592
0.913
0.218
0.206
0.201
0.314
0.688
0.712
0.755
0.304
0.691
0.656
0.611
0.593
0.999
0.801
0.391
0.537
0.816
0.668
0.118
0.153
0.050
0.060
0.111
10·C
0.641
0.729
0.634
0.594
0.588
0.538
0.595
0.908
0.215
0.205
0.199
0.316
0.690
0.715
0.757
0.296
0.690
0.653
0.617
0.594
0.941
0.785
0.394
0.536
0.812
0.665
0.116
0.145
0.049
0.060
0.109
15 ·C
0.615
0.725
0.637
0.595
0.590
0.541
0.597
0.903
0.211
0.203
0.197
0.318
0.691
0.716
0.758
0.288
0.689
0.650
0.622
0.594
0.889
0.769
0.397
0.536
0.807
0.661
0.114
0.138
0.047
0.059
0.106
20·C
0.588
0.721
0.638
0.596
0.591
0.543
0.599
0.898
0.207
0.200
0.195
0.319
0.692
0.717
0.759
0.281
0.688
0.647
0.627
0.595
0.842
0.754
0.398
0.535
0.803
0.657
0.112
0.131
0.045
0.059
0.104
25 ·C
0.559
0.717
0.639
0.596
0.592
0.544
0.601
0.892
0.203
0.198
0.193
0.321
0.692
0.718
0.759
0.273
0.687
0.643
0.630
0.596
0.799
0.739
0.399
0.534
0.799
0.653
0.110
0.125
0.043
0.059
0.102
30·C
0.528
0.713
0.639
0.595
0.592
0.546
0.602
0.887
0.199
0.195
0.190
0.322
0.692
0.718
0.758
0.266
0.686
0.640
0.633
0.596
0.761
0.725
0.398
0.533
0.795
0.649
0.107
0.118
0.042
0.058
0.099
35 ·C
0.495
0.709
0.639
0.595
0.593
0.546
0.604
0.881
0.195
0.191
0.187
0.324
0.691
0.717
0.757
0.259
0.684
0.636
0.635
0.596
0.726
0.711
0.396
0.532
0.790
0.645
0.105
0.112
0.040
0.058
0.097
40·C
0.462
0.704
0.638
0.594
0.592
0.547
0.604
0.876
0.191
0.188
0.184
0.325
0.690
0.716
0.755
0.253
0.682
0.632
0.636
0.597
0.694
0.698
0.392
0.531
0.786
0.641
0.102
0.107
0.039
0.057
0.094
AsO!CO 2
3.3 x 10- s 3.0 xl 0- 5 2.9 xl 0- 5 2.8 xl 0- 5 2.6 xl 0- 5 2.5 x 10- 5 2.5 xl 0- 5 2.4 xl 0- 5 2.3 xl 0- 5
9.9 xl 0- 4 9.5 x 10-4 9.0 xl 0- 4 8.6 xl 0- 4 8.2 X 10- 4 7.8 X 10-4 7.3 x 10-4 6.9 xl 0- 4 6.5 x 10- 4
1.208
1.197
1.188
1.179
1.171
1.162
1.153
1.143
1.134
parisons over a wider range of temperature can be made for only a few ions (H+, Cr,
NHt, OW, HCO;, CO~-, B(OH)4)' The most extensive and reliable measurements are
F. Millero . D. Pierrot
Table 8.2. Activity coefficients of some ions at different temperatures (Millero and Pierrot 1998)
Ion
H+
Li+
Na+
K+
Rb+
O·C
0.687
0.737
0.625
0.590
0.583
Cs+
0.531
NH;
0.588
MgOH+ 0.918
Mg2+
ci+
5r 2 +
F
CI
BrOH
H5
NO;
NO~
HCO~
HSO~
H50~
B(OH)~
HlO~
H2AsO~
Acetate
0.222
0.203
0.203
0.313
0.684
0.709
0.753
0.312
0.691
0.660
0.604
0.592
1.062
0.818
0.386
0.537
0.819
0.672
0.120
0.161
0.052
0.060
0.113
5 ·C
0.664
0.733
0.630
0.592
0.586
0.535
0.592
0.913
0.218
0.206
0.201
0.314
0.688
0.712
0.755
0.304
0.691
0.656
0.611
0.593
0.999
0.801
0.391
0.537
0.816
0.668
0.118
0.153
0.050
0.060
0.111
10·C
0.641
0.729
0.634
0.594
0.588
0.538
0.595
0.908
0.215
0.205
0.199
0.316
0.690
0.715
0.757
0.296
0.690
0.653
0.617
0.594
0.941
0.785
0.394
0.536
0.812
0.665
0.116
0.145
0.049
0.060
0.109
15 ·C
0.615
0.725
0.637
0.595
0.590
0.541
0.597
0.903
0.211
0.203
0.197
0.318
0.691
0.716
0.758
0.288
0.689
0.650
0.622
0.594
0.889
0.769
0.397
0.536
0.807
0.661
0.114
0.138
0.047
0.059
0.106
20·C
0.588
0.721
0.638
0.596
0.591
0.543
0.599
0.898
0.207
0.200
0.195
0.319
0.692
0.717
0.759
0.281
0.688
0.647
0.627
0.595
0.842
0.754
0.398
0.535
0.803
0.657
0.112
0.131
0.045
0.059
0.104
25 ·C
0.559
0.717
0.639
0.596
0.592
0.544
0.601
0.892
0.203
0.198
0.193
0.321
0.692
0.718
0.759
0.273
0.687
0.643
0.630
0.596
0.799
0.739
0.399
0.534
0.799
0.653
0.110
0.125
0.043
0.059
0.102
30·C
0.528
0.713
0.639
0.595
0.592
0.546
0.602
0.887
0.199
0.195
0.190
0.322
0.692
0.718
0.758
0.266
0.686
0.640
0.633
0.596
0.761
0.725
0.398
0.533
0.795
0.649
0.107
0.118
0.042
0.058
0.099
35 ·C
0.495
0.709
0.639
0.595
0.593
0.546
0.604
0.881
0.195
0.191
0.187
0.324
0.691
0.717
0.757
0.259
0.684
0.636
0.635
0.596
0.726
0.711
0.396
0.532
0.790
0.645
0.105
0.112
0.040
0.058
0.097
40·C
0.462
0.704
0.638
0.594
0.592
0.547
0.604
0.876
0.191
0.188
0.184
0.325
0.690
0.716
0.755
0.253
0.682
0.632
0.636
0.597
0.694
0.698
0.392
0.531
0.786
0.641
0.102
0.107
0.039
0.057
0.094
AsO!CO 2
3.3 x 10- s 3.0 xl 0- 5 2.9 xl 0- 5 2.8 xl 0- 5 2.6 xl 0- 5 2.5 x 10- 5 2.5 xl 0- 5 2.4 xl 0- 5 2.3 xl 0- 5
9.9 xl 0- 4 9.5 x 10-4 9.0 xl 0- 4 8.6 xl 0- 4 8.2 X 10- 4 7.8 X 10-4 7.3 x 10-4 6.9 xl 0- 4 6.5 x 10- 4
1.208
1.197
1.188
1.179
1.171
1.162
1.153
1.143
1.134
parisons over a wider range of temperature can be made for only a few ions (H+, Cr,
NHt, OW, HCO;, CO~-, B(OH)4)' The most extensive and reliable measurements are