Fill in the missing chemical formulae in the tables below.
[tex]\begin{tabular}{|c|c|}
\hline acid & conjugate base \\
\hline [tex]\mathrm{H}_3 \mathrm{O}^{+}[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{H}_2 \mathrm{SO}_4[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{H} \mathrm{Br}[/tex] & [tex]\square[/tex] \\
\hline
\end{tabular}
\begin{tabular}{|c|c|}
\hline base & conjugate acid \\
\hline [tex]\mathrm{NH}_3[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{NO}_3^{-}[/tex] & [tex]\square[/tex] \\
\hline [tex]\mathrm{HCO}_3^{-}[/tex] & [tex]\square[/tex] \\
\hline
\end{tabular}[/tex]