why copper gain a greenish layer? …

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why copper gain a greenish layer? Please help..

Posted by Daksh Sharma 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

Copper is not affected by dry air at ordinary temperature. On exposure to moist air, it gets covered with a beautiful green coating of either basic carbonate or basic sulphate.
2Cu + H₂O + CO₂ + O₂ → CuCO₃.Cu(OH)₂
8Cu + 6H₂+2SO₂ + 5O₂→ 2[CuSO₄.3Cu(OH)₂]
Copper present in bronze or in utensils is corroded by moist air containing acidic oxides like carbon dioxide, sulphur dioxide etc. The greenish layer formed is of basic copper carbonate or basic copper sulphate. This phenomenon is called ‘corrosion of metals’

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