pKa's of representative acids and bases

▪ Table

pK_a's of representative acids and bases

pK_a

Inorganic acids

boric acid 9.1 (20 °C)

hypochlorous acid 7.53 (18 °C)

hydrogen sulfide 7.0, 11.9 (18 °C)

carbonic acid 6.4, 10.3

phosphoric acid 2.1, 7.2, 12.8

sulfurous acid 1.8, 6.9 (18 °C)

nitric acid −1.6

sulfuric acid (−3), 1.9

hydrogen chloride (−7)

perchloric acid (−8)

Inorganic bases

ammonia 9.25

hydrazine −0.9, 8.23 (20 °C)

hydroxylamine 6.03 (20 °C)

Alcohols and phenols

methanol 15.5

trifluoroethanol 12.37

phenol 9.89

o-nitrophenol 7.17

m-nitrophenol 8.28

p-nitrophenol 7.15

o-chlorophenol 8.49

m-chlorophenol 8.85

p-chlorophenol 9.18

picric acid 0.38

Carboxylic acids

formic 3.75 (20 °C)

acetic 4.75

chloroacetic 2.85

dichloroacetic 1.48

trichloroacetic 0.70

oxalic 1.23, 4.19

malonic 2.83, 5.69

benzoic 4.19

Nitrogen bases

methylamine 10.66

dimethylamine 10.73

trimethylamine 9.81

piperidine 11.12

aniline 4.63

pyridine 5.25

quinoline 4.90 (20 °C)

pyrrole −0.27

See as table:

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