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.

What is the true about concentration cell? 单项选择题

类似问题

The purpose of the salt bridge in a galvanic cell is to:

When potassium hydroxide is combined with _______, the chemical reaction promotes current flow in the presence of an applied voltage.

A galvanic cell is constructed from the Sn4+/Sn2+ and Zn2+/Zn half cells. With reference to the Standard Reduction Potential Table the formula sheet, which of the following statements is correct about this cell?

In a fuel cell,

In an electrochemical cell, the anode is

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单