Question

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Why
are these sour substances effective in cleaning the vessels? Explain with reaction.​

Answer 1

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The above given question :)

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When copper vessels are exposed to moist air, they form a green coating of basic copper carbonate [CuCO3.Cu(OH)2].

Reaction :

2Cu + CO2 + O2 + H2O --------) CuCO3.Cu(OH)2

|____________| (Green) basic

from moist air copper carbonate

Reason for above question :

The sour substances such as lemon or tamarind juice contain acids. Lemon juice contains citric acid and tamarind contains tartaric acid. These acids dissolve the coating of copper oxide or basic copper carbonate present on the surface of tarnished copper vessels and make them shining red brown again.

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