The electrolysis of aqueous solutions
2 marks · NormalDescribe two essential steps you must take to safely set up apparatus for investigating the electrolysis of concentrated sodium chloride solution in the laboratory.
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Common mistakes: Forgetting to mention safety measures
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Marking points
B1 · 1 mark · Describes, in context, an essential setting-up step (e.g. placing test tubes over electrodes with sodium chloride solution inside, electrodes in correct positions, etc.)
B2 · 1 mark · Mentions a key safety measure (e.g. carrying out in a fume cupboard or wearing eye protection) relevant to the apparatus setup
Worked solution
1. Place a test tube containing sodium chloride solution over each electrode, making sure not to cover the electrodes completely to allow ion flow.
2. Set up the electrolysis in a fume cupboard or well-ventilated area and wear eye protection to protect against chlorine gas exposure.