A chemist titrates 50.0mL of a 0.2431M benzoic acid HC6H5CO2 solution with 0.7074M NaOH solution at 25°C. Calculate the pH at equivalence. The pKa of benzoic acid is 4.20. Round your answer to 2 decimal places.

Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of NaOH solution added.

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?