The p K b pKb values for the dibasic base B B are p K b1 = 2.10 pKb1=2.10 and p K b2 = 7.84 . pKb2=7.84. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.50 M B ( aq ) 0.50 M B(aq) solution with 0.50 M HCl ( aq ) .