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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 100.0 mL of KOH. The Ka of HF is 3.5 × 10^-4. A) 4.15 B) 2.08 C) 3.46 D) 3.15 E) 4.33