In a standard Daniell voltaic cell, the half-cell potentials are: Zn²⁺/Zn (E° = -0.76 V) and Cu²⁺/Cu (E° = +0.34 V). What is the standard electromotive force (E°cell) of the cell?

Answer and explanation

Correct answer: B. +1.10 V

  1. Step 1: Identify cathode and anode: Cu has higher reduction potential, so Cu acts as cathode; Zn oxidizes at anode. Step 2. Standard cell potential: E°cell = E°cathode - E°anode. Step 3. Substitute values: E°cell = (+0.34 V) - (-0.76 V) = +0.34 + 0.76 = +1.10 V. Answer: +1.10 V. Why not the others: +0.42 V subtracts magnitudes; -0.42 V and -1.10 V represent electrolytic polarity reversals.

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