A 100 L Buffer Solution Is 0

Multiple Choice

A 1.00 L buffer solution is 0.250 mol L^-1 in HF and 0.250 mol L^-1 in NaF. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 mol L^-1 HCl. The K_a for HF is 3.5 × 10^-4.

A) 3.09
B) 4.11
C) 3.82
D) 3.46
E) 2.78