The Following Question Refers to a Solution That Contains 1 $\times$

Multiple Choice

The following question refers to a solution that contains 1.59 M hydrofluoric acid,HF (K_a = 7.2 $\times$ 10^-4) ,and 3.00 M hydrocyanic acid,HCN (K_a = 6.2 $\times$ 10^-10) . What is the pH of this mixture of weak acids?

A) 1.47
B) 2.94
C) 4.50
D) 9.01
E) 12.53