AP Chemistryhardmcq1 pt
A Zn-Cu galvanic cell has E°cell = 1.10 V. What is E at 25 °C if [Zn²⁺] = 0.10 M and [Cu²⁺] = 1.0 M?
A.1.13 V
B.1.07 V
C.1.10 V
D.1.16 V
Explanation
Core Concept
For Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s), the reaction quotient is Q = [Zn²⁺]/[Cu²⁺] = 0.10. With n = 2, the Nernst correction is (0.0592/2) × log(0.10) = (0.0296)(−1.00). Subtracting a negative raises the voltage: E = 1.10 + 0.03 ≈ 1.13 V. Starving the product side pushes the reaction forward, so the cell outperforms its standard-state rating.
Correct Answer
A1.13 V
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