A 100.0 mL aliquot of a dibasic compound with Kb1= 1*10^-4 and Kb2 = 1*10^-8 was titrated with 1.00 M HCl and a base concentration of .100 M. Calculate what the pH of the solution would be after 15.0 mL of the acid was added to the 100 mL aliquot base.