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CAIE A Level Chemistry 9701 · Electrochemistry

Electrochemistry: suggest question

Suggest6 marksChallenge

A student electrolyses aqueous sodium chloride using inert carbon electrodes. The electrolyte is a concentrated solution of sodium chloride. The student records the products at each electrode. The student then repeats the electrolysis using a very dilute solution of sodium chloride. Suggest why different products are formed at the anode in the two experiments, and state the product at the anode in each case. Explain your reasoning in terms of the species present and their electrode potentials.

0 words · 6 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.

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