Molekula
Sodium thiosulfate pentahydrate - Analytical Reagent
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Sodium thiosulfate pentahydrate is a white crystalline salt widely used as a reducing agent, in photography for fixing developed films, and as an analytical reagent for titrations and iodine removal. It meets strict analytical standards for precision in laboratory applications. Catalogue details: CAS 10102-17-7, molecular formula Na₂S₂O₃·5H₂O, molecular weight 248.18, stored at ambient conditions, no hazard classification. Molekula supplies sodium thiosulfate pentahydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| pH | 6.5 - 8.5 |
| Chloride (Cl-) | ≤ 0.2% |
| Assay | ⩾ 98.0% |
| Water insoluble matter | ≤ 0.05% |
| Identification (IR) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90037158 |
| CAS Number | 10102-17-7 |
| Molecular Formula | Na2S2O3 · 5H2O |
| Molecular Weight | 248.18 |
| SMILES | O.O.O.O.O.[O-]S(=O)(=S)[O-].[Na+].[Na+] |
| REACH Code | Y113 |
| HTS Code | 28323010 |
| Tariff Code | 2832300000 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is sodium thiosulfate pentahydrate (analytical reagent grade) commonly used for?
It is primarily used in analytical chemistry for titrations (e.g., iodine determination), photography (as a fixer), and as a reducing agent in various laboratory applications.
What is the chemical formula and molecular weight of sodium thiosulfate pentahydrate?
The formula is **Na₂S₂O₃·5H₂O**, and the molecular weight is **248.18 g/mol**.
How should sodium thiosulfate pentahydrate be stored?
Store it in a tightly sealed container at **ambient temperature**, away from moisture and strong oxidizing agents.
What grade of sodium thiosulfate pentahydrate does Molekula supply, and is it suitable for sensitive applications?
Molekula supplies **analytical reagent grade**, which meets high purity standards for precise laboratory and analytical work.
Can Molekula supply sodium thiosulfate pentahydrate in bulk quantities?
Yes, we offer bulk quantities of sodium thiosulfate pentahydrate—please contact us for specific packaging options and minimum order quantities.
What documentation comes with an order of sodium thiosulfate pentahydrate?
Each order includes a **Certificate of Analysis (CoA)** confirming purity and compliance with analytical reagent specifications, along with a safety data sheet (SDS).
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.