Copper Patina Formation (Verdigris)

2Cu + O2 + H2O + CO2 → Cu2(OH)2CO3

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Oxygen O 1 (g)
Reaktant Water H₂O 1 (l)
Reaktant Carbon Dioxide CO₂ 1 (g)
Reaktant Copper Cu 2 (s)

Alltägliches Beispiel

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

Industrielle Bedeutung

Copper patination is deliberately accelerated in architecture for aesthetic purposes. Understanding copper corrosion is essential for building material selection.

Eigenschaften

Typ
Redox
Reversibel
Nein
Energie
Exotherm
ΔH
-720,0 kJ/mol

Verwandte Reaktionen

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.