Standard cell potential
Given E° (Zn²⁺/Zn) = −0.76 V and E° (Cu²⁺/Cu) = +0.34 V, what is E°cell for a galvanic cell made from these half-cells?
Answer D: explanation for every choice
A
This subtracts in the wrong order (anode − cathode).
B
This adds the two reduction potentials as written.
C
This adds the potentials with the wrong sign.
D
Correct. E°cell = E°cathode − E°anode = 0.34 − (−0.76) = +1.10 V. Copper is reduced and zinc is oxidized.
TakeawayE°cell = E°cathode − E°anode. Galvanic cells have positive E°.
Equation usedStandard cell potential
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