Determination of AHxn for the Neutralization Reaction of HCl and NaOH Time (s) 0 Volume of HCl: Tinitial: Data 40.8 mL Volume of NaOH: 49.8mL 2.2.6  Tfinal: 40 C 10 20 30 40 50 60 Accepted value of AHxn for the heat of neutralization of HCl and NaOH: (You will need to look this up.) -57.9 KJ/mol HCl(aq) 70 80 90 Temperature (C) 31.0 100 32.6 38.0 39.7 40.0 110 40.2 40.2 120 130 140 150 40.2 40.2 40.2 40.2 160 170 40.2 180 190 . . 40.2 40.2 200 210 220 230 40 2 40.2 40.2 40.2 40.2 240 250 260 270 280 290 300 40 2 40.2 40.2 40.2 40.2 40.2 40.1 40.1 40 0