Sodium Thiosulfate Pentahydrate
- CAS Number
- 10102-17-7
- HSN Code
- 28323010
- Molecular Formula
- Na2S2O3·5H2O
- Catalogue Number
- AL01429
- Purity
- 99%
- Molecular Weight
- 248.17 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sodium thiosulfate pentahydrate (CAS No. 10102-17-7) is a colorless to white crystalline solid that serves as a highly effective reducing agent. It is widely recognized for its role in iodometric titrations, where it acts as a standard reducing titrant, and in photography, where it is used as a fixer to stabilize images. This compound is classified as extra pure, with a purity of 99%, making it suitable for laboratory and industrial applications that require high-quality reagents. Its molecular weight of 248.17 g/mol and pentahydrate form (Na2S2O3·5H2O) are key characteristics that define its chemical behavior and applications.
Also known as Thiosulfuric acid sodium salt, Sodium thiosulfate, Sodium thiosulphate.
- Catalogue No.
- AL01429
- CAS Number
- 10102-17-7
- Molecular Formula
- Na2S2O3·5H2O
- Molecular Weight
- 248.17 g/mol
- HSN Code
- 28323010
- Grade
- Extra Pure
- Product Form
- Substance
Sodium thiosulfate pentahydrate appears as a colorless to white crystalline solid. It has a melting point of approximately 48.5 °C (118.3 °F) and a boiling point of 100 °C (212 °F) when dissolved in water. The compound is freely soluble in water, with a solubility of about 70 g/100 mL at 20 °C. Its density is approximately 1.67 g/cm³. The compound has a pH value of around 6 to 8 in a 1% aqueous solution, indicating its neutral to slightly alkaline nature.
- Appearance
- Colorless to white crystalline solid
- Shelf Life
- 2 years
- Packaging
- Available in 500 g and 1 kg plastic containers
- Storage
- Store in a cool, dry place away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Sodium Thiosulfate Pentahydrate
- Catalogue No.
- AL01429
- Product form
- Substance
- CAS Number
- 10102-17-7
- EC Number
- 233-327-2
- Grade
- Extra Pure
- EC Index Number
- 016-020-00-8
- Chemical Formula
- Na2S2O3·5H2O
- HSN Code
- 28323010
- Synonyms
- Thiosulfuric acid sodium salt, Sodium thiosulfate, Sodium thiosulphate
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a reducing agent in analytical chemistry and photography.
- 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
- None known.
3.1 — Substance
- Name
- Sodium Thiosulfate Pentahydrate
- CAS No.
- 10102-17-7
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. 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
- May cause mild irritation to skin, eyes, and respiratory tract.
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; however, may release 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 contact with skin and eyes. Use in a well-ventilated area.
- 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 such as strong acids 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
- Not required under normal conditions of use; use in well-ventilated areas.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- Colorless to white
- Odour
- Odourless
- Odour threshold
- Not applicable
- pH value
- 6-8 (1% solution)
- Relative evaporation rate (butylacetate=1)
- Not applicable
- Melting point
- 48.5 °C
- Freezing point
- Not applicable
- Boiling point
- 100 °C (in solution)
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not applicable
- Flammability (solid, gas)
- Non-flammable
- Vapour pressure
- Not applicable
- Relative vapour density at 20°C
- Not applicable
- Density
- 1.67 g/cm³
- Solubility
- Freely soluble in water
- 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; avoid strong acids and oxidizers.
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 oxidizing agents.
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
- Mild irritant.
- Serious eye damage/irritation
- Mild irritant.
- 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 classified as dangerous goods.
- UN-No. (IMDG)
- Not classified as dangerous goods.
- UN-No. (IATA)
- Not classified as dangerous goods.
- UN-No. (ADN)
- Not classified as dangerous goods.
- UN-No. (RID)
- Not classified as dangerous goods.
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Sodium Thiosulfate Pentahydrate
- Proper Shipping Name (IMDG)
- Sodium Thiosulfate Pentahydrate
- Proper Shipping Name (IATA)
- Sodium Thiosulfate Pentahydrate
- Proper Shipping Name (ADN)
- Sodium Thiosulfate Pentahydrate
- Proper Shipping Name (RID)
- Sodium Thiosulfate Pentahydrate
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not applicable
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 thiosulfate is extensively used in analytical chemistry, particularly in iodometric titrations, where it serves as a standard reducing agent to quantify iodine concentrations. In the photographic industry, it is employed as a fixer to remove unreacted silver halides from developed film, thus stabilizing the image. Additionally, it finds applications in water treatment processes, where it is used to dechlorinate water by reducing chlorine to chloride ions. Other uses include its role in the production of sodium sulfite and as an antidote for cyanide poisoning in medical settings.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL01429
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 248.17 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | 99% min | 99.5% |
| Moisture Content | <1% | 0.5% |
| Residue on Ignition | <0.1% | 0.05% |
| Related Substances | None detected | None detected |
| Solubility | Freely soluble in water | Freely soluble in water |
The above product is expected to comply with Extra Pure grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| Extra Pure | 99% | 48.5 °C | <1% | <0.1% | None detected | Freely soluble in water |
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