While preparing for Deepawali Sonia found that all the copper utensils that she used last year have green coloured coating over them. She got upset and started searching on the Google for the ways to clean them. Finally she read that vinegar / lemon juice is very effective for cleaning such deposits. She used lemon juice and was able to restore the shine of the copper utensils.
(a) What is the reason of green coloured coating over copper vessel?
(b) Give the chemical name of the green coloured compound so formed.
(c) How was the lemon juice helpful in removing that coating?
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The answers to the question are given below:
Explanation:
(a) What is the reason for green colored coating over copper vessel?
- When the copper reacts with air, it turns into a green color.
- Due to the oxidation process, it is natural for the copper to turn green.
(b) Give the chemical name of the green-colored compound so formed.
- The green-colored compound formed on the copper is called Patina.
- This happens because of the chemical reaction the copper undergoes.
(c) How was the lemon juice helps in removing that coating?
- Lemon juices help in removing the green-coating of the copper because of the citric acid present in the Lemon juice.
- The citric acid in Lemon juice helps in neutralizing the carbonate present in the copper and dissolves the layer.
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