copper present in brass vessels on exposure to air for a long time from basic copper carbonate and copper hydroxide?
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Explanation:
Upon exposure to air, the copper metal gains a green colour. The formation of green colour is due to corrosion. ... The mixture of hydroxide and carbonate of copper can also be called as basic carbonate.
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When a copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide.
Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). The following is the reaction:
2Cu + H2O + CO2 + O2 → Cu(OH)2 + CuCO3
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