Sometimes copper objects become covered with a layer of pale green
copper carbonate. The chemical formula for copper carbonate is
CuCO3. How many different elements are there in copper carbonate,
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copper(II) cations Cu2+ and carbonate anions CO32
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During monsoon, copper metal, upon exposure to the atmosphere forms a mixture of hydroxide and carbonate of copper. This mixture is obtained due to the reaction of copper metal with water (from moisture present in the air) and oxygen and carbon dioxide gases (present in the atmosphere). The surface of copper metal is coated with a green layer, which contains hydroxide and carbonate of copper. The mixture of hydroxide and carbonate of copper can also be called as basic carbonate.
2 Cu + H2O + CO2 + O2 → Cu(OH)2 + CuCO3
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