Values For Common Substances
There are multiple techniques to determine the pKa of a chemical, leading to some discrepancies between different sources. Well measured values are typically within 0.1 units of each other. Data presented here were taken at 25 °C in water. More values can be found in thermodynamics, above.
| Chemical Name | Equilibrium | pKa |
|---|---|---|
| B = Adenine | BH22+ BH+ + H+ | 4.17 |
| BH+ B + H+ | 9.65 | |
| H3A = Arsenic acid | H3A H2A− + H+ | 2.22 |
| H2A− HA2− + H+ | 6.98 | |
| HA2− A3− + H+ | 11.53 | |
| HA = Benzoic acid | HA H+ + A− | 4.204 |
| HA = Butanoic acid | HA H+ + A− | 4.82 |
| H2A = Chromic acid | H2A HA− + H+ | 0.98 |
| HA− A2− + H+ | 6.5 | |
| B = Codeine | BH+ B + H+ | 8.17 |
| HA = Cresol | HA H+ + A− | 10.29 |
| HA = Formic acid | HA H+ + A− | 3.751 |
| HA = Hydrofluoric acid | HA H+ + A− | 3.17 |
| HA = Hydrocyanic acid | HA H+ + A− | 9.21 |
| HA = Hydrogen selenide | HA H+ + A− | 3.89 |
| HA = Hydrogen peroxide (90%) | HA H+ + A− | 11.7 |
| HA = Lactic acid | HA H+ + A− | 3.86 |
| HA = Propionic acid | HA H+ + A− | 4.87 |
| HA = Phenol | HA H+ + A− | 9.99 |
| H2A = L-(+)-Ascorbic Acid | H2A HA− + H+ | 4.17 |
| HA− A2− + H+ | 11.57 |
Read more about this topic: Acid Dissociation Constant
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