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Names | |||
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IUPAC name
Hydrogen selenide
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Other names
Hydroselenic acid
selane selenium hydride | |||
Identifiers | |||
3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.029.071 | ||
KEGG | |||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 2202 | ||
CompTox Dashboard (EPA)
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Properties | |||
H2Se | |||
Molar mass | 80.98 g/mol | ||
Appearance | Colorless gas | ||
Odor | decayed horseradish[1] | ||
Density | 3.553 g/dm3 | ||
Melting point | −65.73 °C (−86.31 °F; 207.42 K) | ||
Boiling point | −41.25 °C (−42.25 °F; 231.90 K) | ||
0.70 g/100 mL | |||
Solubility | soluble in CS2, phosgene | ||
Vapor pressure | 9.5 atm (21°C)[1] | ||
Acidity (pKa) | 3.89 | ||
Conjugate acid | Selenonium | ||
Conjugate base | Selenide | ||
Structure | |||
Bent | |||
Hazards | |||
EU classification | ![]() ![]() ![]() | ||
Main hazards | Extremely toxic and flammable | ||
NFPA 704 |
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R-phrases | R23/25, R33, R50/53 | ||
S-phrases | (S1/2), S20/21, S28, S45, S60, S61 | ||
Flash point | flammable gas | ||
U.S. Permissible exposure limit (PEL) |
TWA 0.05 ppm (0.2 mg/m3)[1] | ||
Related compounds | |||
Other anions | H2O H2S H2Te H2Po | ||
Other cations | Na2Se Ag2Se | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
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Infobox references | |||
Hydrogen selenide, also known as hydroselenic acid, selenium hydride, or selane, is a chemical compound. Its chemical formula is H2Se. It is an acid. It contains hydrogen and selenide ions.