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If φ represents the reduction potential, which relation correctly gives the standard cell potential?

1. E°cell = φright − φleft
2. E°cell = φleft + φright
3. E°cell = φleft − φright
4. E°cell = −(φleft + φright)

Correct answer: E°cell = φright − φleft

Solution

By convention the cell is written with the cathode (reduction) on the right and anode on the left, so E°cell = phi(right) - phi(left). The correct option is E°cell = phi(right) - phi(left).

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