Sulfur Dioxide Reduction of Dichromate

Cr2O72− + 3SO2 + 2H+ → 2Cr3+ + 3SO42− + H2O

概述

Sulfur dioxide reduces orange dichromate to green chromium(III) while being oxidized to sulfate. This reaction changes the solution color from orange to green and is used as a test for SO₂ gas. Cr(VI) gains 3 electrons per atom while S(IV) loses 2 electrons per atom.

参与者

角色 物质 系数 状态
反应物 Sulfur Dioxide SO₂ 3 (g)
产物 Water H₂O 1 (l)

日常示例

Dichromate-impregnated paper is used as a sensitive test for sulfur dioxide gas, turning from orange to green in its presence.

工业重要性

该反应与烟气脱硫监测和铬处理废水的还原沉淀法相关，是工业环保治理中的重要化学过程。

属性

类型
Redox
可逆
否
能量
放热
ΔH
-850.0 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 Sulfur Dioxide Reduction of Dichromate?
The balanced equation is: Cr₂O₇²⁻ + 3SO₂ + 2H⁺ → 2Cr³⁺ + 3SO₄²⁻ + H₂O.
What type of reaction is Sulfur Dioxide Reduction of Dichromate?
Sulfur Dioxide Reduction of Dichromate is a redox reaction.
Is Sulfur Dioxide Reduction of Dichromate exothermic or endothermic?
Sulfur Dioxide Reduction of Dichromate is exothermic (releases energy). The enthalpy change (ΔH) is -850.0 kJ/mol.