Acid Dissociation Constants Ka:

Acid Formula Ka1 Ka2 Ka3
Acetic CH3COOH    1.75x10-5 
Ammonium Ion NH4+ 5.70x10-10
Anilinium Ion C6H5NH3+ 2.51x10-5
Arsenic H3AsO4 5.8x10-3    1.1x10-7     3.2x10-12 
Arsenous H3AsO3 5.1x10-10
Benzoic C6H5COOH 6.28x10-5
Boric H3BO3 5.81x10-10
1-Butanoic CH3CH2CH2COOH 1.52x10-5
Carbonic H2CO3 4.45x10-7 4.69x10-11
Chloroacetic ClCH2COOH 1.36x10-3
Citric    HOOC(OH)C(CH2COOH)2 7.45x10-4 1.73x10-5 4.02x10-7
Formic HCOOH 1.80x10-4
Fumaric trans-HOOCCH:CHCOOH 8.85x10-4 3.21x10-5
Glycolic HOCH2COOH 1.47x10-4
Hydrazinium Ion H2NNH3+ 1.05x10-8
Hydrazoic HN3 2.2x10-5
Hydrogen Cyanide HCN 6.2x10-10
Hydrofluoric HF 6.8x10-4
Hydrogen Peroxide H2O2 2.2x10-12
Hydrogen Sulfide H2S 9.6x10-8 1.3x10-14
   Hydroxyl Ammonium Ion  HONH3+ 1.10x10-6
Hydrochloric HCl Strong
Hypochlorous HOCl 3.0x10-8
Iodic HIO3 1.7x10-1
Lactic CH3CHOHCOOH 1.38x10-4
Maleic cis-HOOCCH:CHCOOH 1.3x10-2 5.9x10-7
Malic HOOCCHOHCH2COOH 3.48x10-4 8.00x10-6
Malonic HOOCCH2COOH 1.42x10-3 2.01x10-6
Mandelic C6H5CHOHCOOH 4.0x10-4
Methyl Ammonium Ion CH3NH3+ 2.3x10-11
Nitric HNO3 Strong
Nitrous HNO2 7.1x10-4
Oxalic HOOCCOOH 5.60x10-2 5.42x10-5
Perchloric HClO4 Strong
Periodic H5IO6 2x10-2 5x10-9
Phenol C6H5OH 1.00x10-10
Phosphoric H3PO4 7.11x10-3 6.32x10-8 4.5x10-13
Phosphorous H3PO3 3x10-2 1.62x10-7
o-Phthalic C6H4(COOH)2 1.12x10-3 3.91x10-6
Picric (NO2)3C6H2OH 4.3x10-1
Piperidinium C5H11NH+ 7.50x10-12
Propanoic CH3CH2COOH 1.34x10-5
Pyridinium C5H5NH+ 5.90x10-6
Salicylic C6H4(OH)COOH 1.06x10-3
Sulfamic H2NSO3H 1.03x10-1
Succinic HOOCCH2CH2COOH 6.21x10-5 2.31x10-6
Sulfuric H2SO4 Strong 1.02x10-2
Sulfurous H2SO3 1.23x10-2 6.6x10-8
Tartaric HOOC(CHOH)2COOH 9.20x10-4 4.31x10-5
Thiocyanic HSCN 0.13
Thiosulfuric H2S2O3 0.3 2.5x10-2
Trichloroacetic Cl3CCOOH 3
Trimethyl Ammonium Ion (CH3)3NH+ 1.58x10-10

Analytical Chemistry, An Introduction 7th Edition: Appendix 2, p. A-3


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