Hydrogen selenide

Hydrogen selenide
Ball-and-stick model of hydrogen selenide molecule	Space-filling model of the hydrogen selenide molecule Selenium, Se Hydrogen, H
Names
	IUPAC name Hydrogen selenide
	Other names Hydroselenic acid; selane; selenium hydride
Identifiers
CAS Number	7783-07-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:16503 ;
ChemSpider	518 ;
ECHA InfoCard	100.029.071
EC Number	231-978-9;
KEGG	C01528 ;
PubChem CID	533;
RTECS number	X1050000;
UNII	V91P54KPAM ;
UN number	2202
CompTox Dashboard (EPA)	DTXSID20872822 ;
	InChI InChI=1S/H2Se/h1H2 Key: SPVXKVOXSXTJOY-UHFFFAOYSA-N ; InChI=1/H2Se/h1H2 Key: SPVXKVOXSXTJOY-UHFFFAOYAF;
	SMILES [SeH2];
Properties
Chemical formula	H2Se
Molar mass	80.98 g/mol
Appearance	Colorless gas
Odor	decayed horseradish
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)
Solubility in water	0.70 g/100 mL
Solubility	soluble in CS2, phosgene
Vapor pressure	9.5 atm (21°C)
Acidity (pKa)	3.89
Conjugate acid	Selenonium
Conjugate base	Selenide
Structure
Molecular shape	Bent
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Extremely toxic and flammable
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H220, H280, H330, H410
Precautionary statements	P210, P260, P271, P273, P284, P304+P340, P310, P320, P377, P381, P391, P403, P403+P233, P405, P410+P403, P501
NFPA 704 (fire diamond)	4 4 0
Flash point	flammable gas
	Lethal dose or concentration (LD, LC):
LCLo (lowest published)	0.3 ppm (guinea pig, 8 hr); 5.9 ppm (rat, 1 hr)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.05 ppm (0.2 mg/m3)
REL (Recommended)	TWA 0.05 ppm (0.2 mg/m3)
IDLH (Immediate danger)	1 ppm
Safety data sheet (SDS)	ICSC 0284
Related compounds
Other anions	H2O; H2S; H2Te; H2Po
Other cations	Na2Se; Ag2Se
Related compounds	Arsine
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Hydrogen selenide is an inorganic compound with the formula H₂Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H₂Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound^[3] with an exposure limit of 0.05 ppm over an 8-hour period.^[4]^[5] Even at extremely low concentrations, this compound has a very irritating smell resembling that of decayed horseradish or "leaking gas", but smells of rotten eggs at higher concentrations.

^ ^a ^b ^c ^d ^e NIOSH Pocket Guide to Chemical Hazards. "#0336". National Institute for Occupational Safety and Health (NIOSH).
^ "Hydrogen selenide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
^ http://www.epa.gov/ttnatw01/hlthef/selenium.html, US Environmental Protection Agency, Air Toxins website
^ "CDC - Immediately Dangerous to Life or Health Concentrations (IDLH): Hydrogen selenide (as Se) - NIOSH Publications and Products". www.cdc.gov. 2018-11-02. Retrieved 2023-01-09.
^ https://www.cdc.gov/niosh/docs/81-123/pdfs/0336.pdf Occupational Health Guideline for Hydrogen Selenide, The National Institute for Occupational Safety and Health, 1978

[PGCH-1] NIOSH Pocket Guide to Chemical Hazards. "#0336". National Institute for Occupational Safety and Health (NIOSH).

[2] "Hydrogen selenide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[EPA-3] ttp://www.epa.gov/ttnatw01/hlthef/selenium.html, US Environmental Protection Agency, Air Toxins website

[IDLHC-4] "CDC - Immediately Dangerous to Life or Health Concentrations (IDLH): Hydrogen selenide (as Se) - NIOSH Publications and Products". www.cdc.gov. 2018-11-02. Retrieved 2023-01-09.

[OHG-5] ttps://www.cdc.gov/niosh/docs/81-123/pdfs/0336.pdf Occupational Health Guideline for Hydrogen Selenide, The National Institute for Occupational Safety and Health, 1978

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