When a vessel is exposed to moist air for a long time, then a green coating is formed on its surface – why?
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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.
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When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide (cu(oh) 2) and the copper carbonate (cuco3). The following is the reaction :
2Cu+ h2o+Co2+o2 = cu(OH) 2 +CuCo3
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