A chemist titrates 250.0mL of a 0.4080 aniline (C6H5NH2) solution with 0.5336M HNO3 solution at 25C. Calculate the pH at equivalence. The pKb of aniline is 4.87.
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 HNO3 solution added.