Calculate the change in \( \mathrm{pH} \) when \( 3.00 \mathrm{~mL} \) of \( 0.100 \mathrm{M} \mathrm{HCl}(\mathrm{aq}) \) is added to \( 100.0 \mathrm{~mL} \) of a buffer solution that is \( 0.100 \mathrm{M} \) in \( \mathrm{NH}_{3}(\mathrm{aq}) \) and \( 0.100 \mathrm{M} \) in \( \mathrm{NH}_{4} \mathrm{Cl}(\mathrm{aq}) \). Consult the table of ionization constants as needed.
\[
\Delta \mathrm{pH}=
\]
\( -0.026 \)
Calculate the change in \( \mathrm{pH} \) when \( 3.00 \mathrm{~mL} \) of \( 0.100 \mathrm{M} \mathrm{NaOH} \) is added to the original buffer solution.
\( \Delta \mathrm{pH}= \) \( \square \)