What needs to be added to H2SO4 to get H2S?

Usually in the laboratory, hydrogen sulfide is obtained by the action of dilute acids (hydrochloric, sulfuric and others) on metal sulfides. The most common method for producing hydrogen sulfide is the interaction of sulfuric acid and iron (II) sulfide:

FeS + H2SO4 = FeSO4 + H2S.

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