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Hydrogen Sulfide: Dilute Sulphuric Acid on Ferrous Sulfide, Collected over Hot Water (Thorpe 1912)
Pour dilute sulphuric acid on ferrous sulfide and hydrogen sulfide gas bubbles off: FeS + H2SO4 = FeSO4 + H2S. It is the usual laboratory way to make the gas.
Result: hydrogen sulfide, never quite pure: specks of iron in the sulfide add some hydrogen.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 5 (1912), Sulphur. Not given: amounts, acid strength, apparatus. Danger: hydrogen sulfide is a deadly poison and it is flammable; make it only in a fume hood or outdoors. Picture drawn by Youblob.
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