Question

A copper coin was kept dipped in silver nitrate solution for a few hours/days. What will happen to the copper coin? What will happen to the colour of the solution?

September 10, 2024

Answer

Copper is more reactive than silver. Hence, it displaces silver from the silver nitrate solution according to the given reaction.

𝐶𝑢(𝑠) + 2𝐴𝑔𝑁𝑂3(𝑎𝑞) → 𝐶𝑢(𝑁𝑂3)2(𝑎𝑞) + 2𝐴𝑔(𝑠)

𝑐𝑜𝑝𝑝𝑒𝑟 𝑠𝑖𝑙𝑣𝑒𝑟 𝑛𝑖𝑡𝑟𝑎𝑡𝑒 𝑐𝑜𝑝𝑝𝑒𝑟(𝐼𝐼) 𝑛𝑖𝑡𝑟𝑎𝑡𝑒 𝑠𝑖𝑙𝑣𝑒𝑟

The silver thus formed is deposited on the surface of copper, thereby giving it a white shining appearance.

The solution becomes blue due to the formation of copper nitrate.

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