go to jove.com

HIGH SCHOOL

Chemistry

Concept Videos

Analytical Chemistry

This is a free preview. For full access

Electrochemical Analyses and Redox Titration

Electrochemistry and Redox Reactions

Description

Electrochemistry connects electrical measurements with chemical reactions, especially oxidation and reduction. It focuses on how electron movement helps explain reaction behavior.

Oxidation is the loss of electrons from a substance, and reduction is the gain of electrons. A species with strong el...

Transcript

电化学涉及利用电学量来分析化学反应。

氧化还原反应可以分解为两个半反应,用以表示电子从还原剂向氧化剂的转移过程。

当这些电子流经电路时,测得的电流和电池电压可以揭示有关该反应的信息。

当电荷 q 经过电势差 E 时,所做的功与 E 成正比。相反,E 与电化学反应的自由能变化相关。

根据欧姆定律,电流 I 与电路的电阻 R 成反比,与电势 E 成正比。

通过改变电位或电流,可利用电化学实验测定自由能变化及所做的功。