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InterviewSolution
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The following questions refer to the electrolysis of copper sulphate solution with copper electrodes.(i) Compare the change in mass of the cathode with the change in mass of the anode.(ii) What happens, when electrolysis of aqueous copper sulphate between platinum electrode, occurs.(iii) What is the practical application of the electrolysis of copper sulphate solution ? Briefly describe one such application |
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Answer» (i) Mass of Cathode increases where as that of anode decreases due to deposition of pure copper on cathode. (ii) The blue colour of copper sulphate is due to the presence of cupric ions (Cu++ ). Cu++ ions are discharged at the cathode and deposited as Pinkish copper metal, but OH– ions are discharged at anode. The electrolyte consists of hydrogen and sulphate ions which associate to form colourless sulphuric acid. (iii) The electrolysis of copper sulphate solution is used in the purification of copper using pure copper plate as cathode and impure copper plate as anode. |
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