## Chemistry: The Central Science (13th Edition)

Drawing number $(i)$ is the appropriate representation for that situation.
When $NaOH$ is added to a weak acid solution, this reaction will happen: $HA(aq) + NaOH(aq) -- \gt A^-(aq) + Na^+(aq) + H_2O(l)$ Therefore, the concentration of $[HA]$ is decreasing, and the $[A^-]$ is increasing. The figure that represents that situation is the number $(i)$