Sulfur Dioxide Reduction of Dichromate

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

Visão geral

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.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Sulfur Dioxide SO₂	3	(g)
Produto	Water H₂O	1	(l)

Exemplo do cotidiano

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

Importância industrial

Esta reação é relevante para a monitorização de gases de combustão, deteção ambiental de SO₂ e compreensão da química redox do crómio em processos industriais.

Propriedades

Tipo: Redox
Reversível: Não
Energia: Exotérmico
ΔH: -850,0 kJ/mol

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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.