Acid and Base Dissociation Constants in Water at 298 K - Base Constants

CompoundKb
NH3 1.8 x 10-5
H2NNH2 1.0 x 10-6
H2NOH 1.1 x 10-8
(CH3)3N 6.5 x 10-5
(C2H5)3N 4.0 x 10-4
(C2H5)2NH 1.3 x 10-3
C2H5NH2 5.6 x 10-4
C6H5CH2NH2 2.0 x 10-5
(C2H5)3P 5.0 x 10-8
(C2H5)3As 5.0 x 10-12
CompoundKb
C6H5NH2 3.8 x 10-10
C6H5N(CH3)2 1.0 x 10-9
o-FC6H4NH2 1.6 x 10-11
m-FC6H4NH2 2.5 x 10-11
p-FC6H4NH2 4.5 x 10-10
o-NO2C6H4NH2 2.0 x 10-14
m-NO2C6H4NH2 2.5 x 10-12
p-CH3C6H4NH2 1.0 x 10-9
p-CH3OC6H4NH2 2.2 x 10-9
pyridine 1.4 x 10-9

Reference: Lange's Handbook, pps. 8-13 to 8-71.