A buffer solution is prepared by dissolving 1.51 g NH3 and 3.85 g (NH4)2SO4 in enough water to make 0.500 L of solution.
a. What is the pH of this solution?
b. If 0.88 g NaOH is added to this solution, what is the pH? (Neglect any volume change associated with adding the NaOH.)
c. How many mL of 12 M HCl must be added to 0.500 L of the original buffer to change its pH to 9.00?