A. A 75.0-mL volume of 0.200 mol L^-1 NH3 (Kb=1.8×10^−5) is titrated with 0.500 mol L^−1 HNO3. Calculate the pH after the addition of 13.0 mL of HNO3 .
B. A 52.0-mL volume of 0.350 mol L^−1 CH3COOH (Ka=1.8×10^−5. ) is titrated with 0.400 mol L^−1 NaOH. Calculate the pH after the addition of 19.0 mL of NaOH.