B$\mathrm{.}4.$ Calculate the exact alkalinity $[$in eq$/$L$]$ for each of the following water samples:

B$\mathrm{.}4.$a$.$ Water that contains $0\mathrm{.}6580m\frac{g}{L}$ of bicarbonate, as the ion, at a pH of $5\mathrm{.}66.$

B$\mathrm{.}4.$b$.$ Water with pH of $11\mathrm{.}03$ containing $120m\frac{g}{L}$ bicarbonate ion and $15m\frac{g}{L}$ carbonate ion.