Molekula
Sodium sulfite heptahydrate
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 sulfite heptahydrate is a water-soluble inorganic compound used as a reducing agent, antioxidant, and preservative in industrial and laboratory applications. It is commonly employed in photographic processing, water treatment, and chemical synthesis. Available with CAS number 10102-15-5, molecular formula Na2SO3·7H2O, and molecular weight 126.04 g/mol. Stored at ambient temperatures. Signal word: Danger. Molekula supplies Sodium sulfite heptahydrate 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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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 solid |
| Purity | ≥ 98.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90034116 |
| CAS Number | 10102-15-5 |
| IUPAC Name | disodium;sulfite;heptahydrate |
| Molecular Formula | Na2SO3 . 7H2O |
| Molecular Weight | 126.04 |
| Exact Mass | 252.0103 |
| SMILES | O.O.O.O.O.O.O.[O-]S(=O)[O-].[Na+].[Na+] |
| InChIKey | WMJRPJZQQSSDBU-UHFFFAOYSA-L |
| InChI | InChI=1S/2Na.H2O3S.7H2O/c;;1-4(2)3;;;;;;;/h;;(H2,1,2,3);7*1H2/q2*+1;;;;;;;;/p-2 |
| PubChem CID | 160916 |
| REACH Code | Y110 |
| HTS Code | 28321000 |
| Tariff Code | 2832100000 |
Safety & GHS
-
Corrosive
GHS05
-
Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H318 Causes serious eye damage
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
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, 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
- Dinatrium-sulfit-7-wasser
- Dinatrium-sulfit-7-wasser (IUPAC)
- DISODIUM SULFITE, HEPTAHYDRATE
- Sodium sulfite heptahydrate (2:1:7)
- SODIUM SULFITE HEPTAHYDRATE (EP MONOGRAPH)
- Sodium sulfite hydrate
- sodium sulphite heptahydrate
- Sulfurous acid, disodium salt, heptahydrate
- Sulfurous acid, sodium salt, heptahydrate
Frequently asked questions
What is sodium sulfite heptahydrate used for?
It is commonly used as a reducing agent in industrial processes, such as in the pulp and paper industry, and as a preservative in food and pharmaceuticals.
What is the chemical formula and molecular weight of sodium sulfite heptahydrate?
The formula is Na2SO3·7H2O and the molecular weight is 126.04 g/mol.
How should sodium sulfite heptahydrate be stored?
It should be stored at ambient temperature, protected from moisture and heat.
What grade of sodium sulfite heptahydrate does Molekula offer?
Molekula supplies sodium sulfite heptahydrate in reagent grade.
Can Molekula supply sodium sulfite heptahydrate in bulk?
Yes, Molekula can supply sodium sulfite heptahydrate in bulk quantities upon request.
What documentation comes with an order of sodium sulfite heptahydrate?
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.