Question

Name one use each of the by-products obtained in the Chlor-alkali process.

Answer 1

1. Chlor-Alkali product is used for the preparation of sodium hydroxide ($\mathrm{NaOH}$) from common salt ($\mathrm{NaCl}$).
2. Chemical equation involved: $$\begin{gathered} 2\mathrm{NaCl}\left(\mathrm{aq}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\stackrel{\mathrm{electrolysis}}{\to }2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Sodium}\mathrm{Water}\mathrm{Sodium}\mathrm{Chlorine}\mathrm{Hydrogen} \\ \mathrm{Chloride}\mathrm{hydroxide} \end{gathered}$$
3. The By-products of this reaction are chlorine$\left({\mathrm{Cl}}_2\right)$ gas and hydrogen gas$\left({\mathrm{H}}_2\right)$.

Uses of by-products:

1. Use of hydrogen: Hydrogen gas is used as a fuel and in further preparation of ammonia NH₃.
2. Use of Chlorine: Chlorine is used as a Pesticide and for PVC.