H2O3Se
128.99 g/mol
Research ReagentDanger
SELENIOUS ACID
CAS7783-00-8EC231-974-7
Category
Research Reagent
Compound Class
Other
Primary Use
Research Compound
Selenious acid is the principal oxoacid of selenium, with the structure O=Se(OH)2. It is commonly used as a reagent for alkaloids and as an oxidizing agent in laboratory and research settings.
Reagent for alkaloidsOxidizing agent in chemical synthesis
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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Heavy water
CAS7789-20-0
research compound
Referencestereoisomer of
Sodium selenite
CAS10102-18-8
Glass manufacturing and ceramic coloring
Referencestereoisomer of
Zinc selenite
CAS13597-46-1
research compound
Referencestereoisomer of
Barium selenite
CAS13718-59-7
selenium source in industrial applications
Referencestereoisomer of
Sodium selenite pentahydrate
CAS26970-82-1
Nutraceutical and dietary supplement
Safety Reference
Danger
H301Toxic if swallowed
H331Toxic if inhaled
H373May cause damage to organs through prolonged or repeated exposure
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H370Causes damage to organs
H372Causes damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for SELENIOUS ACID (CAS 7783-00-8) is 2811.19.
HS code (international, 6-digit)
2811.19
EU CN code (8-digit)
2811 19 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
selenous acid
InChIKey
MCAHWIHFGHIESP-UHFFFAOYSA-N
SMILES
O[Se](=O)O
Synonyms (19)
- Selenious acid (USP)
- Acid, Selenious
- Acid, Selenous
- Acido selenio
- Acido selenioso
- Hydrogen Selenite
- Monohydrated selenium dioxide
- SELENIOUS ACID
- SELENIOUS ACID [MART.]
- Selenious acid (H2SeO3)
- Selenium (as selenious acid)
- Selenous acid
- Selenous acid (99.999%-Se)
- Selenous acid, p.a.
- acide selenieux
- dihydroxidooxidoselenium
- selenige Saeure
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