Name the colour and chemical Name along with chemical formula of coating observed when copper & Silver undergo corrosion
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The phenomenon is called corrosion. The black coating is silver sulphide (Ag
2
S) formed due to the reaction of H
2
S gas present in the atmosphere with silver and the green coating is basic copper carbonate formed due to the reaction of moist air (CO
2
, O
2
and H
2
O vapours) with copper.
Silver
2Ag
+
Hydrogensulphide
H
2
S
→
Silversulphide(Black)
Ag
2
S
+
Hydrogen
H
2
Copper
2Cu
+
Frommoistair
CO
2
+O
2
+H
2
O
→
Basiccoppercarbonate(green)
CuCO
3
+Cu(OH)
2
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