Two electrolytic cells containing solutions of and are connected in series. If of silver is deposited in the first cell, what mass of copper is deposited in the second cell? (Atomic weights: , )

Answer and explanation

Correct answer: A.

  1. Step 1: According to Faraday's Second Law of Electrolysis, when the same electric charge passes through different electrolytes in series, the masses deposited are proportional to their equivalent weights: .
  2. Step 2: Calculate equivalent weights: , and .
  3. Step 3: Substitute and solve: .
Answer
.
Why not the others: assumes is monovalent (); halves the correct copper mass; multiplies by 4.

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