The chlor-alkali process uses electrolysis to produce chlorine, hydrogen, and sodium hydroxide from an aqueous sodium chloride solution. Electricity is passed through the solution, causing chloride ions to oxidize to chlorine gas at the anode and water molecules to reduce to hydrogen gas and hydroxide ions at the cathode. The sodium ions then react with the hydroxide ions to form sodium hydroxide. Chlorine is used to make polymers and pesticides, hydrogen is used as a reducing agent and fuel, and sodium hydroxide is used in soap, the paper industry, and water treatment.

1. CHLOR-ALKALI PROCESS
DONE BY: SHARON BENNY ALEX

2. DEFINITION:
The chlor-alkali process is an
industrial process for the
electrolysis of sodium chloride
solution (brine solutions).

3. WHAT HAPPENS?
As we know, electrolysis is the passage of electricity through a system containing electrolyte and
electrode to produce a chemical change. Here, the electrolyte contains aqueous sodium chloride solution.
 At the anode oxidation of chloride occurs to give chlorine as
2Cl-
(aq) → Cl2(g) + 2e-
 At cathode, Hydrogen ions from water molecules are reduced to produce hydrogen gas as
2H2O + 2e- → H2(g) + 2OH-
(aq)
 The sodium ions react with hydroxide ions to produce NaOH and the overall electrolytic reaction will
be
2NaCl(aq) + 2H2O → 2NaOH(aq) + Cl2(g) + H2(g)

4. ELECTROLYTIC SET-UP

5. USES OF CHLORINE:
 Manufacture of Polymers.
 Pesticides.
 Antiseptic agent.
 Hydrochloric acid.

6. USES OF HYDROGEN
 Reducing agent.
 Weather balloons.
 Fuel.

7. USES OF SODIUM HYDROXIDE
 Soap.
 Chemical Reagent.
 Paper Industry.
 Water Treatment.

8. THANK YOU