Sodium fluoride, NaF, is added to many municipal water supplies to reduce tooth decay in the population. Calculate the pH of a 0.30 M solution of NaF when 0.10 M of NaOH is added to the solution, Kb = 1.5 x 10-11. A. 3.16 B. 3.69 C. 2.69 D. 11.31 E. 13.01