A chemical compound X is used in glass, soap and paper industries. On treatment with ethanoic acid, it forms salt, water and carbon dioxide.

(a)

Identify X.

(b)

How is this compound obtained from brine ? Write the equations involved.

(c)

State the number of molecules of water of crystallization present in compound X.

(a) \(\displaystyle \mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O} /\) washing soda / sodium carbonate decahydrate

(b) \(\displaystyle \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}+\mathrm{NH}_{3} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{NaHCO}_{3}\) \[\begin{aligned} & 2 \mathrm{NaHCO}_{3} \xrightarrow{\text { heat }} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \\ & \mathrm{Na}_{2} \mathrm{CO}_{3}+10 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O} \end{aligned} \]

(c) $\displaystyle 10$