A 50.0-mL volume of 0.15 mol L' HBr is titrated with 0.25 mol L KOH. Calculate the pH after the addition of 20.0 mL of KOH. Express your answer numerically. View Available Hint(s) pH = Submit Part C A 75.0-mL volume of 0.200 mol L NH3 (Kb = 1.8 x 10 ) is titrated with 0.500 mol L HNO3. Calculate the pH after the addition of 25.00 mL of HNO3. Express your answer numerically. > View Available Hint(s) AX ? pH = Submit Part D A 52.0-mL volume of 0.350 mol L CH3COOH (Ka = 1.8 x 10 5) is titrated with 0.400 mol L-1 NaOH. Calculate the pH after the addition of 27.0 mL of NaOH. Express your answer numerically. View Available Hint(s) ? pH = Submit