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Determine the volume of titrant (KOH) required to reach the indicated pH values for the titration of 50.00 mL of 0.100 M benzoic acid (HC_7H_5O_2, Ka = 6.3 times 10^-5) with 0.0500 M KOH: pH = 4.20, 4.50, 8.06, 11.50 Write the reaction for KOH reacting with benzoic acid and the equilibrium for each pH value.
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