$\begin{align}
& (1)\,NaCl\xrightarrow{t{}^\circ }Na+\frac{1}{2}C{{l}_{2}} \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{A}_{1}})\,\,\,\,\,\,\,\,({{B}_{1}}) \\
& (6)\,2Na+C{{l}_{2}}\to 2NaCl \\
& (2)\,Na+{{H}_{2}}O\to NaOH+\frac{1}{2}{{H}_{2}} \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{A}_{2}}) \\
& (4)\,C{{l}_{2}}+{{H}_{2}}\to 2HCl \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{B}_{2}}) \\
& (7)\,NaOH+HCl\to NaCl+{{H}_{2}}O \\
& (3)\,C{{O}_{2}}+2NaOH\to N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{A}_{3}}) \\
& (5)\,2HCl+Ba{{(OH)}_{2}}\to BaC{{l}_{2}}+2{{H}_{2}}O \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,({{B}_{3}}) \\
& (8)\,N{{a}_{2}}C{{O}_{3}}+BaC{{l}_{2}}\to BaC{{O}_{3}}\downarrow +2NaCl \\
\end{align}$