Why copper turns green and silver turns black when exposed to air?
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The reason for this process is oxidation.
In air oxygen presents and it oxidise copper and silver.
Due to oxidation copper form a thin layer of green coating and silver.
In air oxygen presents and it oxidise copper and silver.
Due to oxidation copper form a thin layer of green coating and silver.
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Answer:
Copper vessels turn green when exposed to air for a long period of time due to corrosion. The copper reacts with the moisture and the various gases present in the atmosphere to form a mixture of copper carbonate (CuCO3) and copper hydroxide (Cu(OH)2) . The reaction is as follows:
2Cu + H2O + CO2 + O2 = CuCO3 + Cu(OH)2
This corrosion can be prevented by applying a layer of grease or paint cover that will prevent the copper surface from coming in contact with the air.
Explanation:
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