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Reactions at the electrodes
Member rating: No Rating | Words: | Submitted: Tue Sep 02 2003
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Open-Book Paper Reactions at the electrodes The membrane cell is used in the extraction of chlorine. The brine containing the chlorine is added to the side with the positive electrode, this is where there is a titanium anode. Here chloride ions are discharged which produces chlorine gas. At the other side of the membrane cell is a steel cathode. The sodium ions, which have passed through the membrane, enter the dilute sodium hydroxide. The steel cathode supplies the water with electrons to liberate hydrogen gas and hydroxide ions. These reactions are redox reactions as there is an oxidation and a reduction. In the reaction that takes place at the anode the chlorine ions are being oxidised and in the reaction that takes places at the cathode the hydrogen is being reduced. It is necessary to keep apart the anode and cathode products of the electrolysis of aqueous sodium chloride to prevent them from...
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