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Extraction of Halogens: Iodine and Chlorine A method of extracting chlorine is via the membrane cell. This process is described below: On one side circulating brine is in contact with a titanium anode and chloride ions are discharged producing chlorine gas: 2Na+ (aq) + 2Cl-(aq) 2Na+ (aq) + Cl2 (g) + 2e- A steel cathode supplies electrons to the water to liberate hydrogen gas and hydroxide ions: 2Na+ (aq) + 2H2O (l) + 2e- 2Na+ (aq) + H2 (g) + 2OH-(aq) Any chemical reaction which involves oxidation and reduction is described as a redox reaction. This therefore causes the above reactions to also be described at redox reactions as reduction and oxidation are taking place. [3] In the process of extraction of halogens it is necessary to keep apart the products formed at both the cathode and anode in order to prevent them reacting. A mercury cathode cell can be used to achieve this, as the products are...

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