1. a student has 200 ml of 50 mm hepes buffer, ph 7.0. the pka of hepes acid is 7.56.
a. they add 2 ml of 0.5 m naoh to the solution. what is the ph of the resulting solution?
b. they then add 20 ml of 0.5 m naoh to their new solution from part a. what is the ph of the resulting solution