Apentix/AP Chemistry/Unit 9: Applications of Thermodynamics/Question
AP Chemistrymediummcq1 pt

Two half-cells share identical Cu electrodes, one dipped in 0.0010 M Cu²⁺ and the other in 0.10 M Cu²⁺. Which statement about this concentration cell is correct?

A.E°cell = 0 V, and Cu²⁺ is reduced spontaneously in the more concentrated half-cell
B.E°cell = +0.34 V because copper's standard potential appears on both sides
C.No voltage develops because both electrodes are the same metal
D.The dilute side acts as the cathode because it absorbs extra ions

Explanation

Core Concept

With identical electrodes the standard terms cancel, so E° = 0 V and all driving force comes from the concentration gap. Spontaneous change equalizes the two solutions: the concentrated side consumes Cu²⁺ at the cathode while the dilute side dissolves copper at the anode. Substituting Q = 0.0010/0.10 = 0.010 into the Nernst equation yields a small positive E, confirming that direction.

Correct Answer

AE°cell = 0 V, and Cu²⁺ is reduced spontaneously in the more concentrated half-cell

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