An aqueous solution of trichloroacetic acid, that is 2.00 percent by weight trichloroacetic acid, has a density of 1.0083 g/mL. A student determines that the freezing point of this solution is -0.382 oC.
Based on the observed freezing point, what is the percent ionization of the acid and the Ka? (Kf for H2O is 1.86 oC/m.)