Acid Dissociation Constant - Values For Common Substances

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

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