In the titration of $56\mathrm{.}00$mL of $0\mathrm{.}500$ M lactic acid $($Ka$=1\mathrm{.}4$x$10^-4)$ with $0\mathrm{.}250$ M potassium hydroxide, what is the pH after $56\mathrm{.}00$mL of the base has been added?