Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. a$.100\mathrm{.}0$mL of $0\mathrm{.}10$ MHC$\_7$H$\_5$O$\_2($K$\_$a$=6\mathrm{.}4\backslash$times $10^-5)$ titrated by $0\mathrm{.}10$ MNaOH pH at the halfway point $=$ pH at the equivalence point $=$ b$.100\mathrm{.}0$mL of $0\mathrm{.}10$ MC$\_2$H$\_5$NH$\_2($K$\_$b$=5\mathrm{.}6\backslash$times $10^-4)$ titrated by $0\mathrm{.}30$ MHNO$\_3$ pH at the halfway point $=$ pH at the equivalence point $=$ c$.100\mathrm{.}0$mL of $0\mathrm{.}80$ MHCl titrated by $0\mathrm{.}15$ MNaOH pH at the halfway point $=$ pH at the equivalence point $=$