The Following Figure Illustrates the Action of a HF and F

Multiple Choice

The following figure illustrates the action of a HF and F^ buffer where the sizes of the boxes are proportional to the concentrations of HF and F^ in solution. If you add hydronium until all of the F^ is converted into HF and then add a little more hydronium, what is observed?

A) The pH increases.
B) The pH decreases.
C) The pH stays the same.
D) The solution will be neutralized.
E) The pH changes, but it is not possible to determine how it will change.