Dichloroacetic Acid HC₂HCl₂O₂, Is a Not-So-Weak Acid with an Ionization

Multiple Choice

Dichloroacetic acid HC₂HCl₂O₂, is a not-so-weak acid with an ionization constant:K_a = 5.5 × 10^-2. Calculate the [H⁺] and the pH of a 0.100 molar solution of this acid.Hint: Simplified assumptions do not work in this case.

A) 1.9 × 10^-2, 1.72
B) 5.2 × 10^-2, 1.29
C) 2.5 × 10^-2, 1.59
D) 3.2 × 10^-2, 1.49
E) 1.1 × 10^-3, 2.98