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OpenStudy (anonymous):
8th grade chemistry! woohoo! jk. Help please! In the equation 2Ag + H2S → Ag2S + H2 (Silver Tarnishing) What is the role of H2S? Please help! Thank u!!
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OpenStudy (anonymous):
Will give medal!!
OpenStudy (joannablackwelder):
Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish; it does not tarnish with only oxygen. It often appears as a dull, gray or black film or coating over metal. Source: http://en.wikipedia.org/wiki/Tarnish
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