Dichromate Oxidation of Ethanol

2Cr2O72− + 3C2H5OH + 16H+ → 4Cr3+ + 3CH3COOH + 11H2O

概述

Potassium dichromate oxidizes ethanol to acetic acid in acidic solution. Chromium(VI) is reduced to chromium(III), changing color from orange to green. The ethanol is oxidized through acetaldehyde to acetic acid. This color change was the basis of early breathalyzer tests.

参与者

角色 物质 系数 状态
反应物 Ethanol C₂H₅OH 3 (aq)
产物 Acetic Acid CH₃COOH 3 (aq)
产物 Water H₂O 11 (l)

日常示例

Early police breathalyzer devices (Breathalyzer tubes) used this reaction, where the orange-to-green color change indicated blood alcohol level.

工业重要性

重铬酸盐氧化是合成乙醛和乙酸的经典实验室方法，也是早期酒精测试设备的化学基础，尽管现代呼吸测醇仪已采用电化学传感器。

属性

类型
Redox
可逆
否
能量
放热
ΔH
-1920.0 kJ/mol

相关反应

Iron(II) to Iron(III) Oxidation by Oxygen Bleaching with Sodium Hypochlorite Copper Reduction of Silver Ion Aqua Regia Dissolving Gold Cerium(IV) Reduction by Iron(II) Chlorine Oxidation of Bromide Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) Displacement of Hydrogen from Acid by Magnesium

Frequently Asked Questions

What is the equation for Dichromate Oxidation of Ethanol?
The balanced equation is: 2Cr₂O₇²⁻ + 3C₂H₅OH + 16H⁺ → 4Cr³⁺ + 3CH₃COOH + 11H₂O.
What type of reaction is Dichromate Oxidation of Ethanol?
Dichromate Oxidation of Ethanol is a redox reaction.
Is Dichromate Oxidation of Ethanol exothermic or endothermic?
Dichromate Oxidation of Ethanol is exothermic (releases energy). The enthalpy change (ΔH) is -1920.0 kJ/mol.