Calculate [H⁺] in a Solution That Is 0

Multiple Choice

Calculate [H⁺] in a solution that is 0.30M in NaF and 0.46 M in HF. (K_a = 7.2 × 10^-4)

A) 1.2 × 10^-4 M
B) 5.7 × 10^-3 M
C) 231.5 × 10^-2 M
D) 4.7 × 10^-4 M
E) 0.46 M