A 25.0 mL sample of 0.150 M benzoic acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The K_a of benzoic acid is 4.50 × 10^-4. A)11.20 B)9.80 C)4.20 D)7.00 E)8.54

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Quizplus · Accepted Answer

At the equivalence point, benzoic acid is completely converted to its conjugate base, benzoate ion. The pH is determined by the hydrolysis of the benzoate ion. Using the Kb calculated from Kw/Ka, the pH is approximately 8.54.

A 250 ML Sample of 0