Question

why copper and brass vessels are cleaned with lemon??

Answer 1

when we rub the tarnished copper vessel with aid of tamarind or lemon juice, the copper oxide seems to react with the citric acid found in the tamarind or lemon to create a salt which is washed away easily with aid of water.

Answer 2

Citric acid in lemon juice etches away copper oxide that gives the vessels the dark color. When the oxide is removed, the copper metal underneath is exposed, it has a common ph range of 2-3 and reacts with metals and serves as a good cleaning fluid for metallic surfaces. copper become "dirty" they have formed a layer of copper oxide on their surface. Copper oxide is a weak base and consequentially reacts with a weak acid, such as lemon juice.

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