Dissociation constant of a weak acid : It is defined as the equilibrium constant for dissociation equilibrium of a weak acid and denoted by Ka.
Explanation : Consider an aqueous solution of a weak acid HA.
HA(aq) ⇋ H+(aq) + A-(aq)
The equilibrium constant called dissociation constant Ka is represented as,
Ka = \(\frac{[H^+]\times[A^-]}{[HA]}\)
