$7$ points

A $0\mathrm{.}125mo\frac{l}{L}$ solution of $C{H}_3\frac{C}{O}O{H}_{()}($acetic acid$)$ has a pH of $3\mathrm{.}67.$

a$.$ Calculate the $K_o$ of the acetic acid $[3$ Marks$][$T$/$T$]$

b$.$ What is the $pH$ of the $0\mathrm{.}125mo\frac{l}{L}$ acetic acid solution after $0\mathrm{.}200mo\frac{l}{L}$ of $C{H}_3\frac{C}{O}ONa$ has been added? $[4$ Marks$][$T$/$T$]$

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