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Why copper vessel forms a green layer on exposure to air and moisture?
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Why copper vessel forms a green layer on exposure to air and moisture?
Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases toform a mixture of copper carbonate andcopper hydroxide. This gives a greencolour to the surface of copper metal.
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Why copper vessel forms a green layer on exposure to air and moisture?
When copper vessel is exposed to air the metal reacts with gases , moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide.
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pH is quite useful to us in a number of ways in daily life. Some of its applications are:Control of pH of the soil: Plants need a specific pH range for proper growth. The soil may be acidic, basic or neutral depending upon the relative concentration of H* and OH-. The pH of any soil can be determined by using pH paper. If the soil is too acidic, it can be corrected by adding lime to it. If the soil is too basic, it can be corrected by adding organic manure which contains acidic materials.Regaining shine of a tarnished copper vessel by use of acids: A copper vessel gets tarnished due to formation of an oxide layer on its surface. On rubbing lenion on the vessel, the surface is cleaned and the vessel begins to shine again. This is due to the fact that copper oxide is basic in nature, which reacts with the acid (citric aci d) present in lemon to form a salt (copper citrat e) which is washed away with water. As a result, the layer of copper oxide is removed from the surface of the vessel and the shining surface is exposed.Self-defence by animals through chemical warfare: Stings of bees and ants contain methanoic acid. When stung, it causes lot of pain and irritation. This can be cured by rubbing the affected area with mild base like baking soda.Q. P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then

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Why copper vessel forms a green layer on exposure to air and moisture?
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