The electrolysis of aqueous solutions
2 marks · HardDescribe two essential safety precautions you must take when setting up an experiment to investigate the electrolysis of concentrated sodium chloride solution in the laboratory.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Also accept: Do not smell chlorine gas; Switch off the power when chlorine detected; Wear gloves; Keep electrodes partially uncovered
Common mistakes: No mention of fume cupboard or well-ventilated area; Forgetting eye protection
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Marking points
B1 · 1 mark · Mentions use of a fume cupboard or well-ventilated area.
B2 · 1 mark · Mentions wearing eye protection (or equivalent clear lab safety equipment/precaution).
Worked solution
Set up and carry out the electrolysis in a fume cupboard or well-ventilated room, because chlorine gas is poisonous.
Wear eye protection to protect yourself from splashes and accidental contact with chemicals.