Worked example: Calculating the pH after a weak acid-strong base reaction (excess acid) 

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When a strong base reacts with excess weak acid, the resulting solution contains both HA and A⁻. We can use reaction stoichiometry to determine the concentration of each species and then solve a common-ion equilibrium problem to find [H₃O⁺] and thus the pH. View more lessons or practice this subject at www.khanacadem...
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