Question

explain why sour substance are effective in cleaning copper vessels

Answer 1

Sour substances are acidic in nature.They react when coming in contact with copper and effectively remove the dirt.

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Answer 2

the copper vessels get a layering of basic copper carbonate on rusting . Sour substances are helpful in cleaning bcoz these react with basic copper carbonate to form salt and water. This reaction is known as neutralization reaction. And hence the vessel is cleaned.