Consider a solution prepared by mixing equal moles of a weak acid HA, HCl, and NaA. Which of the following best describes what happens?

a. The H1 from the HCl reacts completely with the A2 from the NaA. Then the HA dissociates to some extent.

b. The H⁺ from the HCl reacts with the A^- from the NaA to make HA, whereas the HA is dissociating. Eventually you have equal amounts of everything.

c. The H⁺ from the HCl reacts with the A^- from the NaA to make HA, whereas the HA is dissociating. Eventually all the reactions have equal rates.

d. The H⁺ from the HCl reacts completely with the A- from the NaA. Then the HA dissociates until “too much” H1 and A2 are formed, so the H1 and A2 react to form HA, and so on. Eventually equilibrium is reached.

Justify the best choice. For those you did not choose, explain why they are incorrect.