Sodium Sulphite
- CAS Number
- 7757-83-7
- HSN Code
- 28321090
- Molecular Formula
- Na2SO3
- Catalogue Number
- AL1425A
- Purity
- 98% min
- Molecular Weight
- 126.04 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sodium Sulphite 98% AR (anhydrous) is a high-purity analytical reagent used primarily in laboratories for various chemical analyses. This compound is notable for its role as a reducing agent and is widely utilized in the field of analytical chemistry. With a molecular formula of Na2SO3 and a molecular weight of 126.04 g/mol, it is essential for precise applications requiring stringent purity standards. The anhydrous form ensures that it is free from water content, making it suitable for sensitive reactions and analyses.
Also known as Sodium sulfite, Disodium sulfite.
- Catalogue No.
- AL1425A
- CAS Number
- 7757-83-7
- Molecular Formula
- Na2SO3
- Molecular Weight
- 126.04 g/mol
- HSN Code
- 28321090
- Grade
- AR (Analytical Reagent)
- Product Form
- Substance
Sodium Sulphite appears as a white crystalline powder, which is hygroscopic in nature. It has a melting point of approximately 270 °C (decomposes) and is highly soluble in water, with a solubility of about 70 g/L at 20 °C. The compound has a density of 2.63 g/cm³ and does not have a distinct odor. Its pH in a 1% aqueous solution is typically around 9.5, indicating its basic nature. The compound is stable under normal conditions but should be stored in a cool, dry place to prevent moisture absorption.
- Appearance
- White crystalline powder
- Shelf Life
- 2 years
- Packaging
- Available in 500 g and 1 kg polyethylene bottles
- Storage
- Store in a cool, dry place away from moisture and incompatible materials, such as strong acids.
1.1 — Product identifier
- Chemical Name
- Sodium Sulphite
- Catalogue No.
- AL1425A
- Product form
- Substance
- CAS Number
- 7757-83-7
- EC Number
- 231-548-0
- Grade
- AR (Analytical Reagent)
- EC Index Number
- Na2SO3
- Chemical Formula
- Na2SO3
- HSN Code
- 28321090
- Synonyms
- Sodium sulfite, Disodium sulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a reducing agent and 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
- May cause respiratory irritation; avoid inhalation of dust.
3.1 — Substance
- Name
- Sodium Sulphite
- CAS No.
- 7757-83-7
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If symptoms persist, seek medical attention.
- First-aid measures after skin contact
- Wash with soap and water. If irritation occurs, seek medical attention.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing. If irritation persists, seek medical attention.
- First-aid measures after ingestion
- Rinse mouth. Do not induce vomiting. Seek medical attention if symptoms occur.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Irritation of the respiratory tract, skin, and eyes.
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
- Non-flammable, but may emit toxic fumes when heated.
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
- Contain spill and collect using appropriate protective equipment. Dispose of in accordance with local regulations.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Use appropriate personal protective equipment. Sweep up and place in a suitable container for disposal.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Avoid dust formation. Use in a well-ventilated area. Wear appropriate protective equipment.
- 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 cool, dry place, away from incompatible materials.
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 appropriate respiratory protection if dust is generated.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Odourless
- Odour threshold
- Not applicable
- pH value
- 9.5 (1% solution)
- Relative evaporation rate (butylacetate=1)
- Not applicable
- Melting point
- 270 °C (decomposes)
- Freezing point
- Not applicable
- Boiling point
- Not applicable
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- 270 °C
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- Not applicable
- Relative vapour density at 20°C
- Not applicable
- Density
- 2.63 g/cm³
- Solubility
- 70 g/L in water at 20 °C
- Log Pow
- Not applicable
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not applicable
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions; reacts with strong acids to release sulfur dioxide.
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 acids, strong oxidizers.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Low toxicity; LD50 (oral, rat) > 2000 mg/kg.
- Skin corrosion/irritation
- May cause mild skin irritation.
- Serious eye damage/irritation
- May cause eye irritation.
- Respiratory or skin sensitisation
- Not a sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- Not classified as a specific target organ toxicant.
- 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)
- Not assigned
- UN-No. (IMDG)
- Not assigned
- UN-No. (IATA)
- Not assigned
- UN-No. (ADN)
- Not assigned
- UN-No. (RID)
- Not assigned
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Sodium Sulphite
- Proper Shipping Name (IMDG)
- Sodium Sulphite
- Proper Shipping Name (IATA)
- Sodium Sulphite
- Proper Shipping Name (ADN)
- Sodium Sulphite
- Proper Shipping Name (RID)
- Sodium Sulphite
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not classified as hazardous for transport
14.4 — Packing group
- Packing group (ADR)
- Not applicable
- Packing group (IMDG)
- Not applicable
- Packing group (IATA)
- Not applicable
- Packing group (ADN)
- Not applicable
- Packing group (RID)
- Not applicable
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
Sodium Sulphite 98% AR is extensively used in analytical chemistry as a reducing agent, particularly in titrations and redox reactions. It is also employed in the preparation of various sodium sulfite solutions for use in laboratories. Additionally, it finds applications in the food industry as a preservative and in the textile industry for bleaching processes. Its role in the photographic industry as a developer and in wastewater treatment for removing chlorine further highlights its versatility across multiple sectors.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL1425A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 126.04 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay (Purity) | 98% min | 98.5% |
| Moisture Content | <1% | 0.5% |
| Residue on Ignition | <0.5% | 0.3% |
| Solubility | 70 g/L in water at 20 °C | 72 g/L |
The above product is expected to comply with AR (Analytical Reagent) grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| AR | 98% min | 270 °C (decomposes) | <1% | <0.5% | None detected | 70 g/L in water at 20 °C |
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