This dark coating is called tarnish. Compounds in the air and in foods can contact silver metal and react to form tarnish. One such compound is hydrogen sulfide, a gas found in air.

What happens when silver react with h2s?

“Silver will react with extremely low levels of hydrogen sulphide. Hydrogen sulphide and silver react to form black silver sulphide, one of the most insoluble salts of silver and this is what causes the tarnish.

What kind of reaction occurs when silver tarnishes?

oxidation reaction
When silver objects are exposed to pollutants normally found in air, they gradually become dull and discolored. This darkening of silver is called tarnishing. It occurs when silver undergoes a chemical reaction, classified as an oxidation reaction, with sulfur-containing substances.

What is the Colour of silver sulphide?

Grayish-black
S. A dense black solid, it is the only sulfide of silver. It is useful as a photosensitizer in photography….Silver sulfide.

Does silver react with oxygen?

Silver is a very inactive metal. It does not react with oxygen in the air under normal circumstances. It does react slowly with sulfur compounds in the air, however. Silver does not react readily with water, acids, or many other compounds.

How do I get rid of silver sulfide?

There are two ways to remove the offending silver sulfide. One way is to strip it from the surface. The other is to reverse the chemical reaction and turn silver sulfide back into silver. Polishes that contain an abrasive shine the silver by rubbing off the silver sulfide and some of the silver along with it.