Is acetic acid a weak acid or strong acid? Why?
The strength of an acid in aqueous solution depends on the extent of the equilibrium, i.e. the protonolysis reaction......
For strong acids, this equilibrium lies STRONGLY to the right, and there is little of the parent acid,
On the other hand, for weak acids, the equilibrium reaction lies to the left, and at equilibrium there are significant quantities of the parent acid, and reduced concentrations of the hydronium ion......
And we may thus link acid strength with
And of course, for weak acids,
It is a weak acid.
The acid dissociation constant (
Which furthermore indicates that acetic acid is weak, because strong ions ionize almost completely.