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) 55.6
B) 0.162
C) 15.5
D) 2.78 × 10^-3
E) 3.448