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Acid ionization constant (Ka)
The equilibrium constant for the dissociation of a weak acid in water, $K_a = \mathrm{\frac{[H^+][A^-]}{[HA]}}$. A larger value of $K_a$ means the acid dissociates more fully, so it is a stronger acid.
Equilibrium constant
The equilibrium constant $K$ is a ratio that provides a snapshot of the relative concentrations of products and reactants at equilibrium for a reversible chemical reaction.