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Dissociation Constants of Acids

Dissociation constants of weak acids at 298 K
Compound Formula K₁ K₂ K₃

Acetic acid CH₃COOH 1.7510^-5

Arsenic acid H₃AsO₄ 5.610^-3 1.010^-7 3.010^-12

Arsenous acid H₃AsO₃ 5.110^-10

Ascorbic acid C₆H₈O₆ 8.510^-5

Benzoic Acid C₆H₅COOH 6.310^-5

Boric Acid H₃BO₃ 7.310^-10 1.810^-13 1.610^-14

n-Butanoic Acid C₃H₇COOH 1.5210^-5

Carbonic Acid H₂CO₃ 4.310^-7 5.610^-11

Chlorous Acid HClO₂ 1.110^-2

Cyanic Acid HCNO 3.510^-4

Formic Acid HCHO₂ 1.7710^-4

Hydrocyanic Acid HCN 4.910^-10

Hydrofluoric Acid HF 6.810^-4

Hydrogen Sulfide H₂S 8.910^-8 1.210^-13

Hypochlorous Acid HClO 3.510^-8

Hypoiodus Acid HIO 2.310^-11

Nitrous Acid HNO₂ 4.510^-4

Oxalic Acid H₂C₂O₄ 5.910^-2 6.410^-5

Phosphoric Acid H₃PO₄ 7.510^-3 6.210^-8 4.210^-13

Phosphorus Acid H₂PHO₃ 1.610^-2 7.010^-7

Propionic Acid C₂H₅COOH 1.3410^-5

Pyruvic Acid HC₃H₃O₃ 1.410^-4

Sulfuric Acid H₂SO₄ (strong acid) 1.210^-2

Sulfurous Acid H₂SO₃ 1.310^-2 6.310^-8

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Appendix

Dissociation Constants of Acids

Last Update: 2011-04-07