Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (Assume that the temperature is 25°C.) (a) 102.4 mL of 0.16 M HNO2 (Ka= 4.0x10-4) titrated with 0.16 M NaOH halfway point equivalence point 4.0 4.0 = 4.0x10-4) titrated with 0.30 M HNO3 (b) 101.5 mL of 0.15 M (C2H5)3N (Kb halfway point 4.0 equivalence point 4.0 4 (C) 100.5 mL of 0.45 M HClO 4 titrated with 0.23 M KOH halfway point equivalence point 4.0 4.0