Table of pKa valuesa of acids in different solvents from http://dx.doi.org/10.1002/poc.2946
Acid
Fluoradene
Para-Toluenesulfonamide, 4-CH3-C6H4-SO2-NH2
9-C6F5-Octafluorofluorene
Phenol
(C6F5)2CHCN
C6F5CH(CN)COOEt
2,4-Dinitrophenol, 2,4-(NO2)2-C6H3OH
(CF3)3COH
Acetic acid, CH3COOH
(4-CF3-C6F4)2CHCN
4-NO2-C6H4-CH(CN)2
Saccharin
Picric acid, 2,4,6-Trinitrophenol
(4-NO2-C6H4-SO2)2NH
(CF3SO2)3C6H2OH
(C2F5SO2)2NH
(CN)3CH
Triflic acid, trifluoromethanesulfonic acid, CF3SO2OH
Hydrochloric acid, hydrogen chloride, HCl
Hydrobromic acid, hydrogen bromide, HBr
Pentacyanopropene
Hydroiodic acid, hydrogen iodide, HI
a
H2O
pKa
MeCN
pKa
DCEb
pKa
GP
pKa
GP
GA
11.1
10.21
10.1
10.00
9.5
5.89
4.09
5.40
4.76
4.4
2.3
1.80
0.40
<-1
-2.0
<-2
-5.1
-12
-7
-9
-9.02
-9.5
23.90
26.87
18.88
29.14
21.10
17.75
16.66
20.55
23.51
16.13
11.61
14.57
11.00
8.19
4.48
-0.10
5.1
0.70
10.30
5.5
-2.80
2.8
12.5
15.6
3.8
19.6
10.3
7.6
4.7
9.2
15.5
6.0
0.3
5.5
0.0
-3.7
-6.4
-12.3
-6.5
-11.4
-0.4
-4.9
-15.3
-7.7
238.2
244.9
220.4
251.0
229.0
229.8
226.2
237.5
250.1
221.5
219.6
231.6
219.2
213.4
208.4
208.0
216.1
214.8
240.5
233.3
195.9
226.7
324.9
334.0
300.6
342.3
312.4
313.5
308.6
324.0
341.1
302.1
299.5
315.9
299.0
291.1
284.2
283.7
294.8
293.0
328.1
318.3
267.2
309.2
There are numerous comments and details to these values. Please see the original article
http://dx.doi.org/10.1002/poc.2946 for details and comments. b pKa values relative to picric acid in 1,2dichloroethane.