Molekula
Sodium selenite pentahydrate
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 selenite pentahydrate is a water-soluble selenium compound used in nutritional supplements, research, and as a reagent in biochemical studies. It provides bioavailable selenium for metabolic processes. CAS: 26970-82-1, Molecular Formula: Na₂O₃Se · 5H₂O, Molecular Weight: 263.01 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies Sodium selenite 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £60.70 per pack ex VAT · £72.84 inc. VAT
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500 g — £199.60 per pack ex VAT · £239.52 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| pH | 9.8 - 10.8 |
| Loss on Drying | ≤1.0% |
| Chloride (Cl-) | ≤0.01% |
| Solubility | Freely soluble in water, practically insoluble in Ethanol |
| Assay | ≥99% |
| Iron (Fe) | ≤50ppm |
| Lead (Pb) | ≤20ppm |
| Arsenic (As) | ≤10ppm |
| Insoluble Residue | ≤0.15% |
| Selenate and sulphate | ≤0.03% |
| Nitrate (NO3-) | ≤0.01% |
| Carbonate (CO3(2-)) | ≤0.01% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | I |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 22117374 |
| CAS Number | 26970-82-1 |
| IUPAC Name | disodium;selenite;pentahydrate |
| Molecular Formula | Na2O3Se · 5H2O |
| Molecular Weight | 263.01 |
| Exact Mass | 263.9336 |
| SMILES | O.O.O.O.O.[O-][Se](=O)[O-].[Na+].[Na+] |
| InChIKey | TUANAMBRHOLYTH-UHFFFAOYSA-L |
| InChI | InChI=1S/2Na.H2O3Se.5H2O/c;;1-4(2)3;;;;;/h;;(H2,1,2,3);5*1H2/q2*+1;;;;;;/p-2 |
| PubChem CID | 134930 |
| UN Number | UN2630 |
| REACH Code | Y110 |
| HTS Code | 2842.90.9010 |
| Tariff Code | 2842901090 |
Safety & GHS
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Toxic
GHS06
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Health Hazard
GHS07
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Hazardous to the Environment
GHS09
Hazard statements
- EUH031 Contact with acids liberates toxic gas
- H300 Fatal if swallowed
- H317 May cause an allergic skin reaction
- H330 Fatal if inhaled
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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
- disodium selenite hydrate
- disodium selenite pentahydrate
- H10Na2O8Se
- Na2SeO3.5H2O
- Selenious acid, disodium salt, pentahydrate
- Sodium selenite (Na2SeO3) pentahydrate
- sodium selenite hydrate
- Sodium selenite pentahydate
- sodium selenite--water (1/5)
- TUANAMBRHOLYTH-UHFFFAOYSA-L
Frequently asked questions
What is sodium selenite pentahydrate used for?
It is primarily used as a selenium source in nutritional supplements, animal feed, and research applications requiring trace selenium.
What is the chemical formula and molecular weight of sodium selenite pentahydrate?
The formula is Na2O3Se · 5H2O with a molecular weight of 263.01 g/mol.
How should sodium selenite pentahydrate be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade is available for sodium selenite pentahydrate?
Available in research grade; specific industrial or pharmaceutical grades are not specified.
Can Molekula supply sodium selenite pentahydrate in bulk?
Yes, Molekula can supply bulk quantities—please contact sales for pricing and availability.
What documentation comes with an order of sodium selenite pentahydrate?
Each order includes a Certificate of Analysis (CoA); SDS is available upon request.
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.