Bicine $($N$,$N$-$bis $(2$ hydroxyethyl glycine$)$ is another commonly used buffer in biochemistry labs. The structure of the bicine in its fully protonated form is shown below $.$ Draw the titration curve for bicine, assuming the pKa for its free COOH group is $2\mathrm{.}3$ and the pKa for its tertiary amino group $($NH$+)$ is $8\mathrm{.}3.$ Include the isoelectric point in your curve.