A 0.10 M solution of a weak acid, HX, is 0.059% ionized. Evaluate Ka for the acid.
3.5 x 10-8
Since the acid is only 0.059% ionized, therefore the concentration of ions in solution = 0.1 x 0.059 / 100 = 0.000059
Ka = [H+] [X-] / [HX] = (0.000059)2 / 0.1 = 3.5 x 10-8