Correcting Frost Diagram Misconceptions Using Interactive Frost Diagrams

Correcting Frost Diagram Misconceptions Using Interactive Frost Diagrams
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使用交互式 Frost 图纠正 Frost 图误解

DOI:
10.26434/chemrxiv.14602803.v1
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发表时间:
2021
影响因子:
3
通讯作者:
Mark C. Lipke
Mark C. Lipke
中科院分区:
化学2区
文献类型:
--
作者:
K. Dutton;Mark C. Lipke

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霜冻图提供了 水的还原电势和热力学的方便图解 一种元素不同氧化状态的趋势。本科教材 通常将弗罗斯特图上的最低点描述为最稳定的氧化 元素的状态,但这种解释是不正确的,因为 每种氧化态的热力学稳定性取决于特定的氧化还原 溶液中的条件(即环境或环境施加的电位 电极)。更多的混乱是由不同的, 将这些图表的y轴标记为Ne°的约定相互矛盾 或者−Ne°,以及其他可能性。协助讨论和更正 这些常见的错误,我们介绍了一系列交互式Frost图 说明每个变量的相对稳定性的条件依赖关系 元素的氧化状态。我们还提供了教师使用这些互动工具的说明 图表和让学生使用这些图表完成的书面练习。
Frost diagrams provide convenient illustrations of the aqueous reduction potentials and thermodynamic tendencies of different oxidation states of an element. Undergraduate textbooks often describe the lowest point on a Frost diagram as the most stable oxidation state of the element, but this interpretation is incorrect because the thermodynamic stability of each oxidation state depends on the specific redox conditions in solution (i.e., the potential applied by the environment or an electrode). Further confusion is caused by the widespread use of different, contradictory conventions for labeling the y-axis of these diagrams as either nE° or −nE°, among other possibilities. To aid in discussing and correcting these common mistakes, we introduce a series of interactive Frost diagrams that illustrate the conditional dependence of the relative stabilities of each oxidation state of an element. We include instructor’s notes for using these interactive diagrams and a written activity for students to complete using these diagrams.