Dichromate Oxidation of Ethanol

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

نظرة عامة

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.

المشاركون

الدور المادة المعامل الحالة
متفاعل Ethanol C₂H₅OH 3 (aq)
منتج Acetic Acid CH₃COOH 3 (aq)
منتج Water H₂O 11 (l)

مثال من الحياة اليومية

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

الأهمية الصناعية

Dichromate oxidation was historically important in organic synthesis. Modern practice avoids Cr(VI) due to carcinogenicity, replacing it with catalytic or enzymatic methods.

الخصائص

النوع
Redox
قابل للعكس
لا
الطاقة
طارد للحرارة
ΔH
-1920,0 kJ/mol

التفاعلات ذات الصلة

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.