A: A 50.0 mL volume of 0.15 M HBr is titrated with 0.25 M KOH. Calculate the pH after the addition of 13.0mL of KOH.
C: A 52.0mL volume of 0.35M CH3COOH (Ka=1.8x10^-5) is titrated with 0.40 M NaOH. Calculate the pH after the addition of 31.0mL of NaOH.