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Unlike strong acids, weak acids only partially ionize in aqueous solution. As a result, the concentration of H₃O⁺ in a weak acid solution is typically much less than the initial acid concentration. The relative strength of a weak acid is described by the acid ionization constant, Kₐ, which is the equilibrium constant for the reaction of the weak acid with water. View more lessons or practice this subject at https://www.khanacademy.org/science/a...

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