KCET · Chemistry · Electrochemistry

An aqueous solution of \( \mathrm{CuSO}_{4} \) is subjected to electrolysis using inert electrodes. The \( \mathrm{pH} \) of
the solution will

A decrease
B increase or decrease depending on the strength of the current
C increase
D remains unchanged

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Answer & Solution

Correct Answer

(A) decrease

Step-by-step Solution

Detailed explanation

(A)
At cathode \(: \mathrm{Cu}^{+2}(a q)+2 e^{-} \rightarrow \mathrm{Cu}(\mathrm{s})\)
At anode \(: 2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{+}+4 e^{-}\)
Production of \(\mathrm{H}^{+}\)ions will decrease \(\mathrm{pH}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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An aqueous solution of \( \mathrm{CuSO}_{4} \) is subjected to electrolysis using inert electrodes. The \( \mathrm{pH} \) ofthe solution will

Step-by-step Solution

An aqueous solution of \( \mathrm{CuSO}_{4} \) is subjected to electrolysis using inert electrodes. The \( \mathrm{pH} \) of
the solution will