Selenous Acid
- CAS Number
- 7783-00-8
- HSN Code
- 28111990
- Molecular Formula
- H2SeO3
- Catalogue Number
- AL1307A
- Purity
- ≥ 93%
- Molecular Weight
- 128.97 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Selenous acid (selenious acid) is a reactive oxyacid of selenium, recognized for its utility as a synthetic reagent and reference compound in various chemical applications. With a molecular formula of H2SeO3 and a molecular weight of 128.97 g/mol, it is classified under CAS No. 7783-00-8. This compound is notable for its high reactivity and is often employed in the synthesis of selenium-containing compounds, making it an essential reagent in both organic and inorganic chemistry. Its applications extend to analytical chemistry, where it serves as a reference standard for various analytical methods.
Also known as Selenious acid, Selenium trioxide, Selenium(IV) acid.
- Catalogue No.
- AL1307A
- CAS Number
- 7783-00-8
- Molecular Formula
- H2SeO3
- Molecular Weight
- 128.97 g/mol
- HSN Code
- 28111990
- Grade
- 93%
- Product Form
- Substance
Selenous acid appears as a white crystalline solid, which is highly soluble in water, allowing for easy preparation of solutions for laboratory use. The melting point of selenous acid is approximately 40 °C, and it has a boiling point of around 200 °C. The density of selenous acid is about 2.1 g/cm³. It has a characteristic odor that is often described as pungent. Due to its acidic nature, it has a pH value of around 1 when in solution, indicating strong acidity.
- Appearance
- White crystalline solid
- Shelf Life
- -
- Packaging
- -
- Storage
- Store in a cool, dry place, away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Selenous Acid
- Catalogue No.
- AL1307A
- Product form
- Substance
- CAS Number
- 7783-00-8
- EC Number
- 231-974-0
- Grade
- 93%
- EC Index Number
- Not specified
- Chemical Formula
- H2SeO3
- HSN Code
- 28111990
- Synonyms
- Selenious acid, Selenium trioxide, Selenium(IV) acid
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a reagent in organic synthesis and as a reference compound in analytical chemistry.
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.3 — Other hazards
- Other hazards
- Highly toxic; may cause severe burns and respiratory issues upon exposure.
3.1 — Substance
- Name
- Selenous Acid
- CAS No.
- 7783-00-8
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If breathing is difficult, give oxygen. Seek medical attention immediately.
- First-aid measures after skin contact
- Wash skin thoroughly with soap and water. Remove contaminated clothing. Seek medical attention if irritation persists.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing and seek medical attention.
- First-aid measures after ingestion
- Do not induce vomiting. Rinse mouth and seek medical attention immediately.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Symptoms of exposure may include coughing, difficulty breathing, skin irritation, and gastrointestinal distress.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- May emit toxic fumes in a fire. Use appropriate fire-fighting measures.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Evacuate area and ventilate. Wear appropriate protective equipment. Contain spill and prevent entry into waterways.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Absorb spill with inert material and place in a chemical waste container. Dispose of in accordance with local regulations.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Handle with care, using appropriate personal protective equipment (PPE) including gloves and goggles. Avoid inhalation and contact with skin.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Store in a tightly closed container in a cool, dry place, away from incompatible materials such as strong bases and oxidizers.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use a NIOSH-approved respirator if exposure limits are exceeded or if irritation occurs.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Pungent
- Odour threshold
- Not specified
- pH value
- 1 (in solution)
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- 40 °C
- Freezing point
- Not specified
- Boiling point
- 200 °C
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not specified
- Flammability (solid, gas)
- Not flammable under normal conditions
- Vapour pressure
- Not specified
- Relative vapour density at 20°C
- Not specified
- Density
- 2.1 g/cm³
- Solubility
- Soluble in water
- Log Pow
- Not specified
- Viscosity, kinematic
- Not specified
- Viscosity, dynamic
- Not specified
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Reacts with strong bases and oxidizing agents.
10.2 — Chemical stability
- Chemical stability
- Stable under recommended storage conditions.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- No dangerous reactions known under normal conditions of use.
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong bases, oxidizing agents, and reducing agents.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Highly toxic; LD50 (oral, rat) is approximately 50 mg/kg.
- Skin corrosion/irritation
- Causes severe skin burns and eye damage.
- Serious eye damage/irritation
- Causes serious eye damage.
- Respiratory or skin sensitisation
- Not a skin sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- May cause respiratory irritation.
- Specific target organ toxicity (repeated exposure)
- Not classified
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- UN 3283
- UN-No. (IMDG)
- UN 3283
- UN-No. (IATA)
- UN 3283
- UN-No. (ADN)
- UN 3283
- UN-No. (RID)
- UN 3283
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Selenous Acid
- Proper Shipping Name (IMDG)
- Selenous Acid
- Proper Shipping Name (IATA)
- Selenous Acid
- Proper Shipping Name (ADN)
- Selenous Acid
- Proper Shipping Name (RID)
- Selenous Acid
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- 6.1
14.4 — Packing group
- Packing group (ADR)
- II
- Packing group (IMDG)
- II
- Packing group (IATA)
- II
- Packing group (ADN)
- II
- Packing group (RID)
- II
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Selenous acid is primarily used as a reagent in the synthesis of selenium-containing organic compounds, which are important in various fields including pharmaceuticals and agrochemicals. It is also utilized in analytical chemistry as a reference compound for the determination of selenium in different matrices. Additionally, selenous acid plays a role in the preparation of selenium-based catalysts and in the production of glass and ceramics where selenium compounds are required. Its reactivity makes it valuable in redox reactions and as a source of selenium in various chemical processes.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL1307A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 128.97 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | ≥ 93% | 93.5% |
| Moisture Content | ≤ 1% | 0.5% |
| Residue on Ignition | ≤ 0.5% | 0.3% |
| Related Substances | None detected | None detected |
| Solubility | Soluble in water | Fully soluble in water |
The above product is expected to comply with 93% grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 93% | ≥ 93% | 40 °C / 200 °C | ≤ 1% | ≤ 0.5% | None detected | Soluble in water |
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