Iron(II) to Iron(III) Oxidation by Oxygen

4Fe²⁺ + O₂ + 4H⁺ → 4Fe³⁺ + 2H₂O

Visão geral

Ferrous ions (Fe²⁺) are oxidized to ferric ions (Fe³⁺) by dissolved oxygen in acidic solution. This reaction is responsible for the yellowing of iron-containing groundwater upon exposure to air. The green Fe²⁺ solution turns yellow-brown as Fe³⁺ forms.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Oxygen O	1	(g)
Produto	Water H₂O	2	(l)

Exemplo do cotidiano

Well water that is clear underground but turns rusty brown when left standing is undergoing this oxidation of dissolved iron(II) by air.

Importância industrial

A química redox ferro(II)/ferro(III) é fundamental no tratamento de água, geoquímica e bioquímica. A oxidação bacteriana do Fe²⁺ é explorada na biolixiviação de minérios de sulfureto de ferro e está envolvida no ciclo biogeoquímico do ferro.

Propriedades

Tipo: Redox
Reversível: Não
Energia: Exotérmico
ΔH: -176,0 kJ/mol

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Frequently Asked Questions

What is the equation for Iron(II) to Iron(III) Oxidation by Oxygen?

The balanced equation is: 4Fe²⁺ + O₂ + 4H⁺ → 4Fe³⁺ + 2H₂O.

What type of reaction is Iron(II) to Iron(III) Oxidation by Oxygen?

Iron(II) to Iron(III) Oxidation by Oxygen is a redox reaction.

Is Iron(II) to Iron(III) Oxidation by Oxygen exothermic or endothermic?

Iron(II) to Iron(III) Oxidation by Oxygen is exothermic (releases energy). The enthalpy change (ΔH) is -176.0 kJ/mol.