You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.

Monjur Alahi

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


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Salim Ahmed Kawsar

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Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.

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Salim Ahmed Kawsar

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In tarnished copper vessel there is a layer formed due to Corrosion which is basic in nature which get dissolved in the lemon or tamarind juice which are acidic in nature. Copper reacts with moist carbon dioxide in air to form copper vessel which loses its shiny brown surface forming a green layer of copper Carbonate. The Citric acid present in the lemon dissolves this layer and clean the copper vessel.

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Salim Ahmed Kawsar

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Copper reacts with moist carbon dioxide in the air and slowly tosses its shiny brown surface and gains a green coat. This green substance is basic copper carbonate. Citric acid and tartaric acid neutralise copper carbonate. Hence citric or tartaric acid are effective in cleaning the vessel.

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