The following question refers to a solution that contains 1.99 M hydrofluoric acid,HF (Ka = 7.2 10-4) ,and 3.00 M hydrocyanic acid,HCN (Ka = 6.2 10-10) . Determine the [CN-] at equilibrium.
A) 1.9 10-9 M
B) 3.8 10-2 M
C) 4.9 10-8 M
D) 6.2 10-10 M
E) none of these
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