Acid Ka Values
Note: A Kaof "very large" indicates a strong acid
Acid | Formula | Conjugate Base | Ka |
Perchloric | HClO4 | ClO4- | Very large |
Hydriodic | HI | I- | Very large |
Hydrobromic | HBr | Br- | Very large |
Hydrochloric | HCl | Cl- | Very large |
Nitric | HNO3 | NO3- | Very large |
Sulfuric | H2SO4 | HSO4- | Very large |
Hydronium ion | H3O+ | H2O | 1.0 |
Iodic | HIO3 | IO3- | 1.7 x 10-1 |
Oxalic | H2C2O4 | HC2O4- | 5.9 x 10-2 |
Sulfurous | H2SO3 | HSO3- | 1.5 x 10-2 |
Hydrogen sulfate ion | HSO4- | SO42- | 1.2 x 10-2 |
Phosphoric | H3PO4 | H2PO4- | 7.5 x 10-3 |
Citric | H3C6H5O7 | H2C6H5O7- | 7.1 x 10-4 |
Nitrous | HNO2 | NO2- | 4.6 x 10-4 |
Hydrofluoric | HF | F- | 3.5 x 10-4 |
Formic | HCOOH | HCOO- | 1.8 x 10-4 |
Benzoic | C6H5COOH | C6H5COO- | 6.5 x 10-5 |
Acetic | CH3COOH | CH3COO- | 1.8 x 10-5 |
Carbonic | H2CO3 | HCO3- | 4.3 x 10-7 |
Hydrogen sulfite ion | HSO3- | SO32- | 1.0 x 10-7 |
Hydrogen sulfide | H2S | HS- | 9.1 x 10-8 |
Hypochlorous | HClO | ClO- | 3.0 x 10-8 |
Dihydrogen phosphate ion | H2PO4- | HPO42- | 6.2 x 10-8 |
Boric | H3BO3 | H2BO3- | 7.3 x 10-10 |
Ammonium ion | NH4+ | NH3 | 5.6 x 10-10 |
Hydrocyanic | HCN | CN- | 4.9 x 10-10 |
Phenol | C6H5OH | C6H5O- | 1.3 x 10-10 |
Hydrogen carbonate ion | HCO3- | CO32- | 5.6 x 10-11 |
Hydrogen peroxide | H2O2 | HO2- | 2.4 x 10-12 |
Monohydrogen phosphate ion | HPO42- | PO43- | 2.2 x 10-13 |
Water | H2O | OH- | 1.0 x 10-14 |
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