Calculate H⁺ ion concentration from acetic acid (CH₃COOH) if 0.2 mole of HCI is added to 1 L of the solution For acetic acid Ka = 1.8 × 10⁻⁵

a. 2 x 10⁻⁵ M
b. 5.4 x 10⁻⁷ M
c. 3.6 x 10⁻⁶ M
d. 1.8 x 10⁻⁷ M