During the electrolysis of brine, which gas is produced at the anode?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

During the electrolysis of brine, which gas is produced at the anode?

Explanation:
In brine electrolysis the anode is the site of oxidation, and the chloride ions in the solution are the species most easily oxidized. This means chlorine gas is produced at the anode through the reaction that converts two chloride ions into chlorine gas and two electrons: 2Cl− → Cl2 + 2e−. At the same time, water is reduced at the cathode to form hydrogen gas and hydroxide ions, so the overall process is 2NaCl + 2H2O → Cl2 + H2 + 2NaOH. Because chlorine evolution is favored at the anode under these conditions, the gas formed there is chlorine.

In brine electrolysis the anode is the site of oxidation, and the chloride ions in the solution are the species most easily oxidized. This means chlorine gas is produced at the anode through the reaction that converts two chloride ions into chlorine gas and two electrons: 2Cl− → Cl2 + 2e−. At the same time, water is reduced at the cathode to form hydrogen gas and hydroxide ions, so the overall process is 2NaCl + 2H2O → Cl2 + H2 + 2NaOH. Because chlorine evolution is favored at the anode under these conditions, the gas formed there is chlorine.

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