What is the dull coating on copper vessel cause by
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Mixture of copper carbonate and copper hydroxide
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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 and copper carbonate. The following is the reaction
2Cu+ H2o+CO2+O2= Cu(OH)2 + CuCO3
2Cu+ H2o+CO2+O2= Cu(OH)2 + CuCO3
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