pKa values of selected compounds

Measurements are at 25ºC in water for those with a pKa at or above -1.76:

* - 25.00: Fluoroantimonic acid
* - 15.00: Magic acid
* - 10.00: Fluorosulfuric acid
* - 10.00: Perchloric acid
* - 10.00: Hydroiodic acid
* - 9.00: Hydrobromic acid
* - 8.00: Hydrochloric acid
* - 3.00, 1.99: Sulfuric acid
* - 2.00: Nitric acid
* - 1.76: Hydronium ion
* 3.15: Hydrofluoric acid
* 3.75: Formic acid
* 4.04: Ascorbic acid (Vitamin C)
* 4.19: Succinic acid
* 4.20: Benzoic acid
* 4.63: Aniline*
* 4.76: Acetic acid
* 4.76: Dihydrogencitrate ion (Citrate)
* 5.21: Pyridine*
* 6.37: Carbonic acid
* 6.40: Monohydrogencitrate ion Citrate
* 6.99: Ethylenediamine*
* 7.00: Hydrogen sulfide, Imidazole* (as an acid)
* 7.50: Hypochlorous acid
* 9.25: Ammonia*
* 9.33: Benzylamine*
* 9.81: Trimethylamine*
* 9.99: Phenol
* 10.08: Ethylenediamine*
* 10.33: Bicarbonate
* 10.66: Methylamine*
* 10.73: Dimethylamine*
* 10.81: Ethylamine*
* 11.01: Triethylamine*
* 11.09: Diethylamine*
* 11.65: Hydrogen peroxide
* 12.50: Guanidine*
* 12.67: Monohydrogenphosphate ion (Phosphate)
* 14.58: Imidazole (as a base)
* 15.76: Water
* - 19.00 (pKb) Sodium amide
* - 37.00 (pKb) Lithium diisopropylamide (LDA)
* 45.00: Propane
* 50.00: Ethane