Calculate the ph at each of the points in the titration

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Problem- The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.34. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.90 M B(aq) with 0.90 M HCl(aq).

(1) After addition of 25.0mL of HCl

(2) After addition of 50.0mL of HCl

(3) After addition of 75.0mL of HCl

(4) After addition of 100.0mL of HCl

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