Sulfur Dioxide Reduction of Dichromate

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

개요

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.

참여 물질

역할 물질 계수 상태
반응물 Sulfur Dioxide SO₂ 3 (g)
생성물 Water H₂O 1 (l)

일상 속 예시

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

산업적 중요성

이 반응은 연도 가스 모니터링, 환경 SO₂ 검출, 그리고 공업 공정에서의 크로뮴 산화환원 화학 이해와 관련이 있습니다.

성질

유형
Redox
가역 반응
아니오
에너지
발열
ΔH
-850.0 kJ/mol

관련 반응

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.