Copper Patina Formation (Verdigris)

2Cu + O2 + H2O + CO2 → Cu2(OH)2CO3

Visão geral

Copper slowly oxidizes in moist air containing CO₂ to form basic copper carbonate, the green patina known as verdigris. Copper is oxidized from Cu⁰ to Cu²⁺. Unlike iron rust, the copper patina forms a protective layer that prevents further corrosion, which is why copper roofs last centuries.

Participantes

Papel Substância Coeficiente Estado
Reagente Oxygen O 1 (g)
Reagente Water H₂O 1 (l)
Reagente Carbon Dioxide CO₂ 1 (g)
Reagente Copper Cu 2 (s)

Exemplo do cotidiano

The Statue of Liberty's green color is copper patina formed over decades of exposure to New York's atmosphere.

Importância industrial

A patinação do cobre é deliberadamente acelerada na arquitetura por motivos estéticos. A compreensão da corrosão do cobre é essencial para a seleção de materiais de construção.

Propriedades

Tipo
Redox
Reversível
Não
Energia
Exotérmico
ΔH
-720,0 kJ/mol

Reações relacionadas

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 Copper Patina Formation (Verdigris)?
The balanced equation is: 2Cu + O₂ + H₂O + CO₂ → Cu₂(OH)₂CO₃.
What type of reaction is Copper Patina Formation (Verdigris)?
Copper Patina Formation (Verdigris) is a redox reaction.
Is Copper Patina Formation (Verdigris) exothermic or endothermic?
Copper Patina Formation (Verdigris) is exothermic (releases energy). The enthalpy change (ΔH) is -720.0 kJ/mol.