Hydrogen selenide

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Hydrogen selenide
Hydrogen-selenide-2D-dimensions.png
Hydrogen-selenide-3D-vdW.png
IUPAC name Hydrogen selenide
Other names Hydroselenic acid
selane
selenium hydride
Identifiers
CAS number 7783-07-5
PubChem 533
KEGG C01528
ChEBI CHEBI:16503
RTECS number X1050000
SMILES [SeH2]
Properties
Molecular formula H2Se
Molar mass 80.98 g/mol
Appearance Colorless gas
Odor horseradish
Density 3.553 g/cm3
Melting point

-65.73 °C, 207 K, -86 °F

Boiling point

-41.25 °C, 232 K, -42 °F

Solubility in water 0.70 g/100 mL
Solubility soluble in CS2, phosgene
Acidity (pKa) 3.89
Structure
Molecular shape Bent
Hazards
MSDS ICSC 0284
EU classification Highly Flammable (F+)
Toxic (T)
Dangerous for the environment (N)
EU Index 034-002-00-8
NFPA 704

NFPA 704.svg

4
4
0
 
R-phrases Template:R23/25, R33, R50/53
S-phrases (S1/2), Template:S20/21, S28, S45, S60, S61
Flash point flammable gas
Related compounds
Other anions H2O
H2S
H2Te
H2Po
Other cations Na2Se
Ag2Se
Related compounds Arsine
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

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[change | change source]

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[change | change source]

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[change | change source]

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.

Related pages[change | change source]