Selenous acid

Selenous acid[1]
Structural formula
Ball-and-stick model
Selenous acid on a watchglass
Names
IUPAC names
Selenous acid
Selenic(IV) acid
Other names
Selenious acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.029.067 Edit this at Wikidata
EC Number
  • 231-974-7
KEGG
RTECS number
  • VS7175000
UNII
UN number 3283 2630
  • InChI=1S/H2O3Se/c1-4(2)3/h(H2,1,2,3) checkY
    Key: MCAHWIHFGHIESP-UHFFFAOYSA-N checkY
  • InChI=1/H2O3Se/c1-4(2)3/h(H2,1,2,3)
    Key: MCAHWIHFGHIESP-UHFFFAOYAW
  • O[Se+]([O-])O
Properties
H2SeO3
Molar mass 128.984 g·mol−1
Appearance white hygroscopic crystals
Density 3.0 g/cm3
Melting point decomposes at 70 °C
very soluble
Solubility soluble in ethanol
Acidity (pKa) pKa1 = 2.46
pKa2 = 7.3[2]
Conjugate base Hydrogenselenite
−45.4·10−6 cm3/mol
Pharmacology
Intravenous infusion
Legal status
Hazards
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H301, H331, H373, H410
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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Selenious Acid
Clinical data
AHFS/Drugs.comMonograph
License data
Identifiers
DrugBank
CompTox Dashboard (EPA)
ECHA InfoCard100.029.067 Edit this at Wikidata

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.

  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. ^ Ka and pKa for Polyprotic Acids. ucdsb.on.ca