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in Electrochemistry by (33.4k points)
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In the chemistry lab, a student immersed two platinum electrodes in a solution of CuSO4 and electric current was passed through the solution. After sometime he noticed that the colour of CuSO4 disappeares with the evolution of a gas at the electrode. In his Practical Log, he recorded that the colourless solution contains H2SO4 .

1. Is it true? 

2. Comment on his findings and justify your answer.

1 Answer

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by (36.2k points)
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Best answer

1. Yes.

2. When aqueous CuSO4 solution is electrolysed using Pt electrodes, Cu is deposited at the cathode and O2 is liberated at the anode.

CuSO4 (aq) → Cu2+(aq) + SO42-(aq)

Cu2+ (aq) + 2\(\bar e\) → Cu(s) (at cathode)

H2O(l) → 2H+(aq) + 1/2 O2(g) + 2\(\bar e\) (at anode) 

Thus, H2SO4 is formed as the secondary product.

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