Chemistry
(a) How would you change a metal like Cu into it's ions?
(b) How would you change Cu2+ ions to Cu?
Electrolysis
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Answer
(a) By the method of electrolysis, metal like Cu can be changed into it's ions.
Using —
electrolyte : A solution of copper sulphate and dil. sulphuric acid
Cathode : Thin strip of pure copper
Anode: Impure copper
When the current is passed through the electrolyte, the copper block loses electrons and passes into solution as soluble copper ions.
Cu - 2e- ⟶ Cu2+
(b) By the same process as above, when current is passed through the electrolyte, the copper ions of the copper sulphate solution are attracted to the cathode where they gain electrons and gets deposited on the copper strip.
Cu2+ + 2e- ⟶ Cu
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