A Buffer Was Prepared by Mixing 0

Multiple Choice

A buffer was prepared by mixing 0.60 moles of HF and 0.40 moles of NaF in enough water to make 1.00 L of solution. What is the pH of this solution?
K _a = 3.5×10 ^{- 4} for HF.

A) 10.72
B) 3.48
C) 3.58
D) 10.42
E) 3.28