A solution is prepared by mixing 500 mL of 0.150 M CH_3 COOH and 500.0 mL of 0.20 M CH_3 COONa. K_a for CH_3 COOH is 1.8 times 10^5. a. Calculate the pH of this buffer. b. What is the pH after 1.5 mL of 1.0 M HCl is added to 25.0 mL of this buffer. c. What is the pH of the solution after 1.5 mL of 1.0 M NaOH is added to 25.0 mL of this buffer. a. Will a precipitate of magnesium fluoride form when 300.0 mL of 1.2 times 10^3 M MgCl_2 are added to 500.0 mL of 1.5 times 10^3 M NaF? (K_sp (MgF_2) = 6.9 times 10^-9) I r