(Solved): The pKb values for the dibasic base B are pKb1=2.10 and pKb2=7.30. Calculate the pH at ...

The $\mathrm{p}{K}_{\mathrm{b}}$ values for the dibasic base $\mathrm{B}$ are $\mathrm{p}{K}_{\mathrm{b}1}=2.10$ and $\mathrm{p}{K}_{\mathrm{b}2}=7.30$. Calculate the $\mathrm{pH}$ at each of the points in the titration of $50.0\mathrm{mL}$ of a $0.50\mathrm{MB}(\mathrm{aq})$ solution with $0.50\mathrm{M}\mathrm{HCl}(\mathrm{aq})$. What is the $\mathrm{pH}$ before addition of any $\mathrm{HCl}$ ? $\mathrm{pH}=$ What is the $\mathrm{pH}$ after addition of $25.0\mathrm{mL}\mathrm{HCl}$ ? $\mathrm{pH}=$ What is the $\mathrm{pH}$ after addition of $50.0\mathrm{mL}\mathrm{HCl}$ ? $\mathrm{pH}=$ What is the $\mathrm{pH}$ after addition of $75.0\mathrm{mL}\mathrm{HCl}$ ? $\mathrm{pH}=$ What is the $\mathrm{pH}$ after addition of $100.0\mathrm{mL}\mathrm{HCl}$ ? $\mathrm{pH}=$