Sulfur Dioxide Reduction of Dichromate

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

概要

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.

参加者

役割 物質 係数 状態
反応物 Sulfur Dioxide SO₂ 3 (g)
生成物 Water H₂O 1 (l)

日常の例

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

産業上の重要性

この反応は排煙ガスのモニタリング、環境SO₂検出、工業プロセスにおけるクロムの酸化還元化学の理解に関連する。

特性

タイプ
Redox
可逆的
いいえ
エネルギー
発熱性
ΔH
-850.0 kJ/mol

関連する反応

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.