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QUESTION 23 (6 marks) a) Identify the products of the electrolysis of 1) molten sodium chloride: [1 mark] 1) dilute aqueous sodium chloride solution: [1 mark] b) Explain how the nature of the electrolyte affects the products generated when a dilute aqueous solution of sodium chloride undergoes electrolysis. [4 marks]
QUESTION 3 Predict which product is formed at the positive electrode when a 0.1 M aqueous solution of copper(II) sulfate is electrolysed using carbon electrodes. (A) Cu(s) (B) H (g) (C) O (g) (D) SO (g)
QUESTION 5 (8 marks) One step in the electrolytic refining of copper uses impure copper anodes and high purity copper cathodes in an electrolyte solution of copper(II) sulfate. a) Predict whether the concentration of the copper(II) sulfate solution will change during the purification process. Provide appropriate half-equations to support your reasoning. [4 marks] b) Ifthe copper anodes contain silver and zinc impurities determine whether either metal could be produced as a by-product of the electrolytic refining of copper. Explain your reasoning. [4 marks]
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