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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 before the addition of any KOH. The Ka of HF is 3.5 x 10^-4. A) 3.46 B) 0.70 C) 4.15 D) 2.08 E) 1.00