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 0.311 M in formic acid and 0.189 M in sodium formate (NaHCO₂) . The K_a of formic acid is 1.77 ×10^{- 4}.

A) 0.0952
B) 1.06 × 10^{- 3}
C) 11.3
D) 3.529
E) 37.8