Copper Patina Formation (Verdigris)

2Cu + O₂ + H₂O + CO₂ → Cu₂(OH)₂CO₃

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Oxygen O	1	(g)
Chất phản ứng	Water H₂O	1	(l)
Chất phản ứng	Carbon Dioxide CO₂	1	(g)
Chất phản ứng	Copper Cu	2	(s)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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

Tính chất

Loại: Redox
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -720,0 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) 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.