Common salt is an important raw material for various chemicals of daily use. State in brief the method of…
Common salt is an important raw material for various chemicals of daily use. State in brief the method of preparation of (i) Sodium hydroxide, and (ii) Sodium hydrogen carbonate from common salt. Write balanced chemical equations of the reactions that occur.
Solution
(a) (i) Electricity is passed through an aqueous solution of NaCl (brine), it decomposes to form NaOH. / Chlor-Alkali Process
2NaCl(aq) + 2H2O → 2NaOH(aq) + Cl2 + H2
(ii) When brine reacts with carbon dioxide and ammonia, sodium hydrogen carbonate and ammonium chloride are formed
2NaCl + H2O + CO2 + NH3 → NaHCO3 + NH4Cl