Estimate the $pH$ of the leachate in contact with landfill gas.

Assume the composition of the landfill gas in contact with the leachate

is $40$ percent carbon dioxide and $60$ percent methane, the landfill gas is

saturated with water vapor at a temperature of $50C(122F),$ and the

pressure within the landfill is atmospheric. The alkalinity of the leachate

is $600m\frac{g}{L}.$