What is the true about concentration cell?

Question

What is the true about concentration cell?

BlackTom AI · Accepted Answer

First, let's lay out the scenario described in the question: a concentration cell generates electrical potential due to differences in ion concentrations between two half-cells.
Option 1: 'the cell voltage never varies by more than 1.00 × 10−14 V.' This statement is not a general rule for concentration cells. While Nernst equation can yield specific values depending on concentrations, there is no universal ceiling of 1.00×10−14 V governing concentration cells, so this is inaccurate as a blanket claim.
Option 2: 'the voltage is generated because of a difference in concentrations.' This is the essential characteristic of a concentration cell: the electrochemical potential arises from concentration gradients of the same species (e.g., Ag+ or Cu2+ ions) between the two half-cells, producing a measurable emf. This captures the key concept correctly.
Option 3: 'the concentrations of all cell components are all 1.00 M.' Requiring all components to be 1.00 M is not a defining feature of a concentration cell. The cell operates on a difference in ion concentrations between the two half-cells, not on equalizing all concentrations across all species.
Option 4: 'the concentrations of all cell components remain constant throughout the life of the cell.' In a functioning concentration cell, the concentrations at the two halves are not both constant with respect to each other; as the cell operates, ions move and the local concentrations change until equilibrium is approached. Hence this claim is false.
Option 5: 'none of these choices are correct.' Since option 2 correctly identifies the mechanism behind concentration cells, this choice is incorrect.
To summarize the logic: the defining feature of a concentration cell is a potential produced by a gradient in ion concentrations between the two compartments, not a universal voltage cap, not universal 1.00 M concentrations, and not constant concentrations during operation. Therefore, option 2 correctly describes the true aspect of a concentration cell, while the other options misstate or overgeneralize aspects of how these cells behave.

CHM-1020-LD01.2025SU Quiz- 7 (Electrochemistry)

What is the true about concentration cell?

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