In which one of the following solutions will acetic acid have the greatest percent ionization?
◦ 0.1 M CH3COOH
◦ 0.1 M CH3COOH dissolved in 0.1 M HCl
◦ 0.1 M CH3COOH dissolved in 0.2 M HCl
◦ 0.1 M CH3COOH plus 0.1 M CH3COONa
◦ 0.1 M CH3COOH plus 0.2 M CH3COONa