Part II. The Ka for hydrofluoric acid, HF, is 7.2 x 10-4. 1. Sketch a diagram of the general shape of the titration of 50.0 mL of 0.200 M HF vs. 0.100 M NaOH. Label the axes; location of the equivalence point; the region of buffering capacity; and the region in which [OH-] controls pH. 2. What is the pH of the solution at 0.00 mL of added base? 3. What is the pH when 50.0 mL of 0.100 M NaOH have been added? 4. What is the pH when 100.0 mL of 0.100 M NaOH have been added?