MathLiveAcid dissociation constant
The acid dissociation constant gives the equilibrium ratio of the product of conjugate base and hydronium ion concentrations to the undissociated acid concentration in solution, measuring how strong an acid is. The concentration of water is omitted, as is standard for dilute aqueous solutions. It is used to compare acids and to calculate pH and the extent of ionization of weak acids.
K_\mathrm{a} = \frac{[\mathrm{A^-}][\mathrm{H_3O^+}]}{[\mathrm{HA}]}What the symbols mean
| acid dissociation constant (dimensionless when using activities) | |
| equilibrium concentration of the conjugate base (mol/L) | |
| equilibrium concentration of hydronium ions (mol/L) | |
| equilibrium concentration of the undissociated acid (mol/L) |
About this formula
- FieldChemistry
- TopicAcid-base equilibria
- LevelUniversity
- Also calledacidity constant, Ka, acid ionization constant, equilibrium constant of acid dissociation, acid strength constant, Ka formula
- SourceWikidata Q325519
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