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Silver articles becomes black on prolonged …

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Silver articles becomes black on prolonged exposure to air. This is due to the formation og?

Posted by आनंद नागापुरे 6 years, 2 months ago

CBSE > Class 10 > Science

3 answers

Raunak Chauhan 6 years, 2 months ago

As we know that silver is the most unreactive metal but on the prolonged exposure it react with hydrogen sulphide and form silver sulphide and become black. That form a layer on silver article that's also prevent silver article from fruther corrosion

Aadya Singh ? 6 years, 2 months ago

Silver sulphide...

Yogita Ingle 6 years, 2 months ago

Silver article become black because silver reacts with H2s gas present in air to form black coating of Ag₂S

When the silver react with the hydrogen sulfide gas that is present in the air to form a black coating of silver sulfide. Silver sulfide are insoluble in all the solvents.

The balanced chemical reaction will be,

{tex}2Ag(s)+H_2S(g)\rightarrow Ag_2S(s)+H_2(g){/tex}

By the stoichiometry, 2 moles of silver react with the 1 mole of hydrogen gas to give 1 mole of silver sulfide and 2 moles of hydrogen gas.

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