Molekula
Sodium bisulfite (Sodium hydrogen sulfite) 38% aqueous solution
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 (sodium hydrogen sulfite) is a versatile reducing agent and antioxidant widely used in food preservation, water treatment, photography, and chemical synthesis to prevent oxidation, dechlorinate water, and stabilize solutions. This 38% aqueous solution has a CAS number of 7631-90-5, with the molecular formula NaHSO3 and a molecular weight of 104.06. It requires ambient storage conditions and carries no signal word. 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.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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 | Clear light yellow liquid |
| Heavy metals | ≤ 5ppm |
| Chloride (Cl-) | ≤ 120ppm |
| Assay | ⩾ 38.0% |
| Water insoluble matter | ≤ 20ppm |
| Sulphates (SO4)(2-) | ≤1.0% |
| Ferric salt | ≤ 10ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90037466 |
| 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 | Y113 |
| TSCA Listed | Yes |
| HTS Code | 28321000 |
| Tariff Code | 2832100000 |
Safety & GHS
Hazard statements
- H303 May be harmful if swallowed
Precautionary statements
- P264 Wash thoroughly after handling
- 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
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
No alternate names recorded for this product.
Frequently asked questions
What is sodium bisulfite (38% aqueous solution) commonly used for?
This solution is primarily used as a reducing agent in photography, food preservation (as an antioxidant/preservative, e.g., E222), and as a bleach inhibitor in textiles and paper industries. It’s also employed in water treatment and pH adjustment.
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** for the anhydrous form.
How should sodium bisulfite (38% aqueous solution) be stored?
Store in a tightly sealed container at **ambient temperature**, away from strong oxidizing agents, heat, and direct sunlight. Avoid contamination with metals or acidic substances.
What grades or purities of sodium bisulfite solution does Molekula supply?
Molekula supplies this product as a **38% aqueous solution** (technical grade), suitable for industrial, food-grade (where compliant with local regulations), and laboratory applications.
Can Molekula supply sodium bisulfite in bulk quantities?
Yes, we offer **bulk quantities** (drums, IBCs, or tanker loads) of sodium bisulfite solution, with flexible packaging options to meet your specific requirements. Minimum order quantities may apply.
What documentation is provided with a sodium bisulfite order?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS/SDS), and a product specification sheet. For food-grade applications, additional compliance documentation (e.g., FDA or EU food-grade certifications) may be provided 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.