Selenous acid

Selenious Acid
Clinical data
AHFS/Drugs.com	Monograph
License data	US DailyMed: Selenious_acid;
Identifiers
DrugBank	DB11127;
CompTox Dashboard (EPA)	DTXSID9024300 ;
ECHA InfoCard	100.029.067

Selenous acid^[1]
Names
	IUPAC names Selenous acid; Selenic(IV) acid
	Other names Selenious acid
Identifiers
CAS Number	7783-00-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:26642 ;
ChEMBL	ChEMBL2009089;
ChemSpider	1060 ;
DrugBank	DB11127;
ECHA InfoCard	100.029.067
EC Number	231-974-7;
KEGG	D05814 ;
PubChem CID	1091;
RTECS number	VS7175000;
UNII	F6A27P4Q4R ;
UN number	3283 2630
CompTox Dashboard (EPA)	DTXSID9024300 ;
	InChI InChI=1S/H2O3Se/c1-4(2)3/h(H2,1,2,3) Key: MCAHWIHFGHIESP-UHFFFAOYSA-N ; InChI=1/H2O3Se/c1-4(2)3/h(H2,1,2,3) Key: MCAHWIHFGHIESP-UHFFFAOYAW;
	SMILES O[Se+]([O-])O;
Properties
Chemical formula	H2SeO3
Molar mass	128.984 g·mol−1
Appearance	white hygroscopic crystals
Density	3.0 g/cm3
Melting point	decomposes at 70 °C
Solubility in water	very soluble
Solubility	soluble in ethanol
Acidity (pKa)	pKa1 = 2.46; pKa2 = 7.3
Conjugate base	Hydrogenselenite
Magnetic susceptibility (χ)	−45.4·10−6 cm3/mol
Pharmacology
Routes of; administration	Intravenous infusion
Legal status	US: ℞-only;
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501
Related compounds
Other anions	Selenic acid; Hydrogen selenide
Other cations	Sodium selenite
Related compounds	Sulfurous acid; Tellurous acid; Polonous acid;
	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

Selenous acid (or selenious acid) is the chemical compound with the formula H₂SeO₃. Structurally, it is more accurately described by O=Se(OH)₂. It is the principal oxoacid of selenium; the other being selenic acid.

^ Lide DR (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–81. ISBN 0-8493-0594-2.
^ K_a and pK_a for Polyprotic Acids. ucdsb.on.ca

[hand-1] Lide DR (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–81. ISBN 0-8493-0594-2.

[2] K_a and pK_a for Polyprotic Acids. ucdsb.on.ca

[1]

[2]

Names



IUPAC names Selenous acid Selenic(IV) acid
Other names Selenious acid
Identifiers
CAS Number	7783-00-8^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:26642^Y
ChEMBL	ChEMBL2009089
ChemSpider	1060^Y
DrugBank	DB11127
ECHA InfoCard	100.029.067
EC Number	231-974-7
KEGG	D05814^Y
PubChem CID	1091
RTECS number	VS7175000
UNII	F6A27P4Q4R^Y
UN number	3283 2630
CompTox Dashboard (EPA)	DTXSID9024300
InChI InChI=1S/H2O3Se/c1-4(2)3/h(H2,1,2,3)^Y Key: MCAHWIHFGHIESP-UHFFFAOYSA-N^Y InChI=1/H2O3Se/c1-4(2)3/h(H2,1,2,3) Key: MCAHWIHFGHIESP-UHFFFAOYAW
SMILES O[Se+]([O-])O
Properties
Chemical formula	H₂SeO₃
Molar mass	128.984 g·mol⁻¹
Appearance	white hygroscopic crystals
Density	3.0 g/cm³
Melting point	decomposes at 70 °C
Solubility in water	very soluble
Solubility	soluble in ethanol
Acidity (pK_a)	pK_a1 = 2.46 pK_a2 = 7.3^[2]
Conjugate base	Hydrogenselenite
Magnetic susceptibility (χ)	−45.4·10⁻⁶ cm³/mol
Pharmacology
Routes of administration	Intravenous infusion
Legal status	US: ℞-only
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501
Related compounds
Other anions	Selenic acid Hydrogen selenide
Other cations	Sodium selenite
Related compounds	Sulfurous acid Tellurous acid Polonous acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references