A solution that contains 1.48 M hydrofluoric acid, HF (Ka = 7.2E-4), and 3.00 M hydrocyanic acid, HCN (Ka = 6.2E-10).
What is the pH of this mixture of weak acids?
a) 1.49
b) 2.97
c) 4.52
d) 9.04
e)12.51
The correct answer is a. But I don't know how to get this answer. Can someone help me? Thanks!