ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis3 Marks
Question
How is impure copper purified by electrolysis ? Explain.
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Answer
Electrolytic refining is used for the purification of copper. In this case Cathode : Pure copper strip Anode : Impure copper Electrolyte : A solution of copper sulphate and dilute sulphuric acid.
When the current is passed through the electrolyte , the copper ions of the copper sulphate solution are attracted to the cathode where they gain electrons and are deposited on pure copper strips. The impure copper loses electrons and passes into solution as soluble copper ions. At Cathode : $Cu^{+2} + 2e^- → Cu$ At anode : $Cu + 2e^- → Cu^{+2}$
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