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Unlike strong acids/bases, weak acids and weak bases do not completely dissociate (separate into ions) at equilibrium in water, so calculating the pH of these solutions requires consideration of a unique ionization constant and equilibrium concentrations. Although this is more difficult than calculating the pH of strong acid or base solutions, most acids and bases are weak. The same basic method can be used to determine the pH of aqueous solutions of many different weak acids and bases.
This material is based upon work supported by the National Science Foundation under Grant Number 1246120