n which one of the following solutions will acetic acid have the greatest percent ionization?

Question

a) 0.1 M CH3COOH
b) 0.1 M CH3COOH dissolved in 0.1 M HCl
c) 0.1 M CH3COOH dissolved in 0.2 M HCl
d) 0.1 M CH3COOH plus 0.1 M CH3COONa
e) 0.1 M CH3COOH plus 0.2 M CH3COONa

Answer 1

dont quote me, but I would guess A because according to le chatlier's priciples of equilibrium, the addition of a common ion pushes it towards the reactants side (non ionized)

Answer 2

Cassandra C is right. (a) is the right answer because of the common ion effect.