(Solved): A buffer solution is prepared from equal volumes of \( 0.200 \mathrm{M} \) acetic acid and \( 0.600 ...

A buffer solution is prepared from equal volumes of \( 0.200 \mathrm{M} \) acetic acid and \( 0.600 \mathrm{M} \) sodium acetate. Use \( 1.80 \times 10^{-5} \) as \( K_{\mathrm{a}} \) for acetic acid. What is the \( \mathrm{pH} \) of a solution that results when \( 6.00 \mathrm{~mL} \) of \( 0.340 \mathrm{MHCl} \) is added to \( 0.200 \mathrm{~L} \) of the original buffer? a) \( 5.165 \) b) \( 4.725 \) c) \( 5.221 \) d) \( 6.752 \)