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**Molecular formula:** H₂S
**Molar mass:** 38,081 g/mol
**Information:** Hydrogen sulfide is a colourless, extremely poisonous gas smelling like rotten eggs. Hydrogen sulfide has only reducing properties. It behaves as a weak dibasic acid.
**Use:** Hydrogen sulfide is used in analytical chemistry for the analysis of metal ions.
**Appearance:** Occurs in volcanic gases.
