Calculate the Percent Ionization of Formic Acid (HCO₂H) in a Solution

Multiple Choice

Calculate the percent ionization of formic acid (HCO₂H) in a solution that is 0.219 M in formic acid. The K_a of formic acid is 1.77 × 10^{- 4}.

A) 12.2
B) 3.94 × 10^{- 5}
C) 0.280
D) 0.0180
E) 2.87