Question

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? *

Answer 1

Answer:

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Answer 2

Answer:

A) The Copper utensil was exposed to moisture and the outer environment which led to the forming of the green coating or patina

B) It is a mixture of copper carbonate and copper hydroxide also known as Patina

C) This is because the acid in lemon juice strips the Patina from the copper.

Hope this helps.