|Hydrogen Telluride||Hydrogen Tetracarbonylferrate(II)||Hydrohydrastinine||Hydromorphone||Hydrone?|
|Jmol-3D images||Image 1|
|Molar mass||34.08 g mol−1|
|Odor||faint rotten egg|
|Density||1.363 g dm−3|
|Melting point||−82 °C; −116 °F; 191 K|
|Boiling point||−60 °C; −76 °F; 213 K|
|Solubility in water||4 g dm−3 (at 20 °C)|
|Vapor pressure||1740 kPa (at 21 °C)|
|Refractive index (nD)||1.000644 (0 °C)|
|Dipole moment||0.97 D|
heat capacity C
|1.003 J K−1 g−1|
|Std enthalpy of
|EU classification||F+ T+ N|
|R-phrases||R12, R26, R50|
|S-phrases||(S1/2), S9, S16, S36, S38, S45, S61|
|Flash point||-82.4 °C|
|Autoignition temperature||232 °C; 450 °F; 505 K|
|Related hydrogen chalcogenides||Water
(what is: / ?)|
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Hydrogen sulfide (British English: hydrogen sulphide, but this spelling is not recommended by the International Union of Pure and Applied Chemistry nor the Royal Society of Chemistry) is the chemical compound with the formula H
2S. It is a colorless gas with the characteristic foul odor of rotten eggs; it is heavier than air, very poisonous, corrosive, flammable and explosive.
Hydrogen sulfide often results from the bacterial breakdown of organic matter in the absence of oxygen, such as in swamps and sewers; this process is commonly known as anaerobic digestion. H
2S also occurs in volcanic gases, natural gas, and some well waters. The human body produces small amounts of H
2S and uses it as a signaling molecule.
Dissolved in water, hydrogen sulfide is known as hydrosulfuric acid or sulfhydric acid, a weak acid.
Swedish chemist Carl Wilhelm Scheele is credited with having discovered hydrogen sulfide in 1777.