Anode Dissolves Linearly in CuSO₄ Electrolysis with Cu Electrodes

Steps:

• At the anode, copper oxidizes: Cu(s) → Cu²⁺(aq) + 2e⁻, releasing Cu²⁺ ions into solution.
• Constant current ensures steady electron flow, so oxidation rate remains uniform.
• By Faraday's first law, mass lost equals charge passed divided by electrochemical equivalent, yielding linear mass decrease.
• Plotting anode mass vs. time gives a straight line with negative slope.

Why C is correct:

• C depicts a straight line decreasing over time, matching Faraday's law for constant current and anode dissolution.

Why the others are wrong:

• A: Horizontal line implies no mass change, but anode dissolves.
• B: Increasing line suits cathode deposition, not anode loss.
• D: Curved line suggests varying rate, but current is constant.

Final answer: C