give reason why the blue colour of aq. Cooper 2 sulphate solution remain unchange during electrolysis of aq. cuso4
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2
Answer:
The blue coloured aqueous copper (II) sulphate solution remains unchanged during electrolysis when copper electrodes are used but it fades when platinum electrodes are used.
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Answer: The decrease in the weight of copper anode is equal to the increase in weight of copper cathode.
So it can be deduced that for every Cu2+ discharging at cathode a copper atom ionises from anode to form Cu2+ ion.
Thus concentration of copper ions in electrolyte remain unchanged. As the blue colour of electrolyte is due to the presence of Cu++ ions, therefore it does not change.
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