COMEDK · Chemistry · 18. Electrochemistry

A current of 3.0A is passed through 750 ml of 0.45 M solution of CuSO\(_4\) for 2 hours with a current efficiency of 90%. If the volume of the solution is assumed to remain constant, what would be the final molarity of CuSO\(_4\) solution?

A 0.296
B 0.316
C 0.237
D 0.4

Verified Solution

Answer & Solution

Correct Answer

(B) 0.316

Step-by-step Solution

Detailed explanation

The reaction for the electrolysis of CuSO\(_{4}\) is Cu\(^{2+}\) + 2e\(^{-} \rightarrow\) Cu(s). The total charge passed through the solution is \(Q = I \times t \times \text{efficiency}\). \(Q = 3.0 \text{ A} \times (2 \times 3600 \text{ s}) \times 0.90 = 19440 \text{ C}\). The…

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.

Same subject

Explore more questions on app

From COMEDK

Explore more questions on app