Table of pKa values for acids and bases

Below is a table of pKa values for some common acids and bases at 25oC:

Acids pKa
Trichloroacetic acid CCl3COOH 0.52
Iodic acid HIO3 0.77
Sulfurous acid H2SO3 1.81
Phosphoric acid H3PO4 2.12
Nitrous acid HNO2 3.37
Hydrofluoric acid HF 3.45
Formic acid HCOOH 3.75
Acetic acid CH3COOH 4.75
Carbonic acid H2CO3 6.37
Hydrocyanic acid HCN 9.31
Bases pKa
Urea CO(NH2)2 0.1
Aniline C6H5NH2 4.63
Hydroxylamine NH2OH 6.03
Hydrazine NH2NH2 8.23
Ammonia NH3 9.25
Methylamine CH3NH2 10.56
Ethylamine C2H5NH2 10.81

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Author: Christopher Saywell (document modification date: 7th April 2004)