Hydrogen selenide
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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 |  F+  T+  N
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| 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 | {{{value}}} | ||
| Other cations | {{{value}}} | ||
| Related compounds | {{{value}}} | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
 verify (what is   ?)
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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
[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.
References
[change | change source]- ↑ 1.0 1.1 1.2 NIOSH Pocket Guide to Chemical Hazards. "#0336". National Institute for Occupational Safety and Health (NIOSH).