Dichromate Oxidation of Ethanol
2Cr2O72− + 3C2H5OH + 16H+ → 4Cr3+ + 3CH3COOH + 11H2O
Обзор
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.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Ethanol C₂H₅OH | 3 | (aq) |
| Продукт | Acetic Acid CH₃COOH | 3 | (aq) |
| Продукт | Water H₂O | 11 | (l) |
Пример из жизни
Early police breathalyzer devices (Breathalyzer tubes) used this reaction, where the orange-to-green color change indicated blood alcohol level.
Промышленное значение
Dichromate oxidation was historically important in organic synthesis. Modern practice avoids Cr(VI) due to carcinogenicity, replacing it with catalytic or enzymatic methods.
Свойства
- Тип
- Redox
- Обратимая
- Нет
- Энергия
- Экзотермическая
- ΔH
- -1920,0 kJ/mol
Связанные реакции
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)
Copper Oxidation by Nitric Acid
Hypochlorite Oxidation of Hydrogen Peroxide
Hydrogen Peroxide as Oxidizing Agent (Acidic)
Hydrogen Peroxide Disproportionation
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.