Hydrogen selenide

This article is about the acidic gas. For hydrogen selenide with one hydrogen taken away, see hydroselenide.
Hydrogen selenide
Structural diagram of the hydrogen selenide molecule
Structural diagram of the hydrogen selenide molecule
Space-filling model of the hydrogen selenide molecule
Space-filling model of the hydrogen selenide molecule
Names
IUPAC name
Hydrogen selenide
Other names
Hydroselenic acid
selane
selenium hydride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.071
KEGG
RTECS number
  • X1050000
UNII
UN number 2202
  • [SeH2]
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 Flammable F+ Very Toxic T+ Dangerous for the Environment (Nature) N
Main hazards Extremely toxic and flammable
NFPA 704

4
4
0
 
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
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Other cations {{{value}}}
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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.

Properties

Hydrogen selenide is a colorless gas that dissolves in water to make an acidic solution. It smells like rotten horseradish. It is very toxic. It burns easily, making selenium dioxide. It is similar to hydrogen sulfide, a gas that smells like rotten eggs. It is a strong reducing agent.

Preparation

Hydrogen selenide can be made by hydrolysis of aluminium selenide. This reaction also makes aluminium hydroxide. It can be made by reacting hydrogen with powdered selenium at a high temperature.

Uses

It can be used to add selenide ion to organic compounds. It can also be used to make selenium by reacting it with sulfur dioxide. This makes selenium, sulfur, and water.

References

  1. ↑ 1.0 1.1 1.2 NIOSH Pocket Guide to Chemical Hazards. "#0336". National Institute for Occupational Safety and Health (NIOSH).