Molekula
Sodium bisulfite (Sodium hydrogen sulfite)
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 bisulfite is a white crystalline powder used as a reducing agent, preservative, and antioxidant in pharmaceuticals, food, and industrial processes. It is also employed in photographic chemicals and water treatment. Available in 1 kg, 5 kg, and 25 kg packaging, it has a molecular formula of NaHSO3, molecular weight of 104.06 g/mol, and CAS number 7631-90-5. Store at ambient temperature. Molekula supplies Sodium bisulfite 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.
Often bought together
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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500 g — £28.00 per pack ex VAT · £33.60 inc. VAT
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1 kg — £38.00 per pack ex VAT · £45.60 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 to off-white crystalline powder |
| Heavy metals | ≤ 0.001% |
| pH | 4.0 - 5.0 |
| Chloride (Cl-) | ≤ 0.05% |
| Assay | ≥ 98.0% (Titration against NaOH, 1:1) |
| Water insoluble matter | ≤ 0.2% |
| Iron (Fe) | ≤ 0.2% |
| Arsenic (As) | ≤ 0.0002% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White crystal or crystalline powder |
| Odour | Slight sulfurous odor |
| Boiling Point | 104 °C |
| Density | 1.34 (relative, water = 1) |
| Vapour Pressure | 2.4 kPa at 20 °C |
| Refractive Index | 1.526 |
Source: PubChem CID 23665763 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 10878741 |
| CAS Number | 7631-90-5 |
| IUPAC Name | sodium hydrogen sulfite |
| EC Number | 231-548-0 |
| Molecular Formula | NaHSO3 |
| Molecular Weight | 104.06 |
| Exact Mass | 103.9544 |
| SMILES | OS(=O)[O-].[Na+] |
| InChIKey | DWAQJAXMDSEUJJ-UHFFFAOYSA-M |
| InChI | InChI=1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1 |
| PubChem CID | 23665763 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2832.10.00.00 |
| Tariff Code | 2832100000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- EUH031 Contact with acids liberates toxic gas
- H302 Harmful if swallowed
- H319 Causes serious eye irritation
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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 bisulfite used for?
Sodium bisulfite is commonly used as a preservative in food and pharmaceuticals, and as a reducing agent in chemical processes such as dyeing and photography.
What is the chemical formula and molecular weight of sodium bisulfite?
The chemical formula is NaHSO3 and the molecular weight is 104.06 g/mol.
How should sodium bisulfite be stored?
It should be stored at ambient temperature, in a dry, well-ventilated area, away from incompatible materials.
What grade of sodium bisulfite does Molekula supply?
Molekula supplies sodium bisulfite in reagent grade, suitable for laboratory and industrial applications.
Can Molekula supply sodium bisulfite in bulk?
Yes, Molekula can supply sodium bisulfite in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a sodium bisulfite order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
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.