Sulfur Dioxide Reduction of Dichromate

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

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Sulfur Dioxide SO₂	3	(g)
Sản phẩm	Water H₂O	1	(l)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

This reaction is relevant to flue gas monitoring, environmental SO₂ detection, and understanding chromium redox chemistry in industrial processes.

Tính chất

Loại: Redox
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -850,0 kJ/mol

Phản ứng liên quan

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 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.