Calculate the alkalinity $(m\frac{g}{L}$ as $CaC{O}_3)$ of the leachate when the concentration of $C{O}_2$ is $500m\frac{g}{L}$ and the $pH$ is $7\mathrm{.}0$ in the leachate. Landfill gas in contact with the leachate is saturated with water vapor at a temperature of $40C,$ and the pressure within the landfill is atmospheric. If required, assume property and describe what you assumed. $(4$ point$)CaC{O}_3=100\frac{g}{m}ol,C{O}_2=44\frac{g}{m}ol$

$[H^{+}][HC{O}_3^{-}][H_{2}C{O}_3^{**}]=5\mathrm{.}07{10}^{-7}$

$[H^{+}][C{O}_3^{2-}][HC{O}_3^{-})$