why do silver particles kept in the open for few days? name the phenomenon involved? name the black substance formed and give its chemical formulae...
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Air contains traces of hydrogen sulphide (H2s) gas. It slowly reacts with silver present in the silver article to form silver sulphide ( black in colour ). A coating of silver sulphide (Ag2S) gets deposited on the surface of the metal. The phenomenon is Known as corrosion. Tooth pastes generally contain traces of hydrogen peroxide as one of the constituents. It reacts with silver sulphide to form silver sulphate, whiteness is restored to the article.
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