Calculate the Percent Ionization of Nitrous Acid in a Solution

Multiple Choice

Calculate the percent ionization of nitrous acid in a solution that is 0.222 M in nitrous acid (HNO₂) and 0.278 M in potassium nitrite (KNO₂) . The acid dissociation constant of nitrous acid is
4) 50 × 10^{- 4}.

A) 2.78 × 10^{- 3}
B) 55.6
C) 0.161
D) 15.5
E) 3.448