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A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HF is 3.5 × 10^-4. A) 3.09 B) 4.11 C) 2.78 D) 3.82 E) 3.46