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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis2 Marks
Question
When copper sulphate solution is electrolysed with copper electrodes, the blue copper ions are discharged at cathode and get deposited at it, yet the blue colour of copper sulphate does not fade. Explain.
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Answer

It is because the number of copper ions discharged at the cathode is equal to the number of copper atoms which ionise to form copper ions at the anode.
As the concentration of copper ions does not change in electrolyte, therefore, blue colour of copper sulphate solution does not fade.

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