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A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 400.0 mL of KOH. The Ka of HF is 3.5 × 10^-4. A) 12.78 B) 12.30 C) 12.60 D) 13.85 E) 13.08