ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis3 Marks
Question
Describe what happens to the iron object and the copper rod.
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Answer
The copper anode continuously dissolves as ions in solution and is replaced periodically. The electrolyte dissociates into $Cu ^{+2}$ ions which migrate towards the iron object taken as the cathode and are deposited as neutral copper atoms on the cathode. Electrolyte: Aqueous solution of nickel sulphate Dissociation : $CuSO _4 \rightleftharpoons Cu ^{2+}+ SO _4{ }^{2-}$ $ H _2 O \rightleftharpoons H ^{+}+ OH ^{-} $ Electrodes: Cathode: Article to be electroplated Anode: Block of pure copper Electrode reactions: Reaction at cathode: $Cu ^{2+}+2 e ^{-} \rightarrow Cu$ (deposited) Reaction at anode: $Cu -2 e ^{-} \rightarrow Cu ^{2+}$
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