Problem $4$: Using the $C_T$ value from the below graph find the concentrations of $HC{O}_3^{-}$

$C{O}_3^{2-}$

$O{H}^{-},$ and $H^{+}$at $pH7\mathrm{.}5$ and $11$ by both from graph $($no need to draw the graph$)$ and from equations.