Sodium sulfite
Sodium sulfite (CAS 7757-83-7), molecular formula Na2SO3, is a high-purity chemical supplied by Tech Serve Solutions for chemical synthesis applications, to pharmacopoeia specification (USP, BP, EP). Every batch is tested and ships with a Certificate of Analysis; MSDS and technical data sheets are available on request. Tech Serve Solutions has supplied laboratory reagents, fine chemicals and pharmaceutical intermediates worldwide since 1998.
| Molecular weight | 126.04 |
|---|---|
| Linear formula | Na2SO3 |
| Assay | 95.0-100.0% (iodometric) |
| Grade | JIS special grade |
| Solubility | H2O: soluble1 M at 20 °C, clear, colorless |
| pH | 9.0-10.5 (25 °C, 1 M in H2O) |
| Loss on drying | ≤0.1% loss on drying, 20 °C (HV) |
| Impurities tested | residual solvents, complies≤0.001% heavy metals (as Pb)≤0.05% thiosulfate (S2O3) |
| Suitability | complies for appearance of solution |
| Protective equipment | Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Risk statements (R) | 31 |
| Supplemental hazards | Contact with acids liberates toxic gas. |
| Cation traces | Fe: ≤10 mg/kgSe: ≤10 mg/kgZn: ≤10 mg/kg |
| Anion traces | chloride (Cl-): ≤200 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Availability | available only in Japan |
|---|---|
| Absorption | absorption1M/265 nm, H2O cut-off |
Documentation
Supplied to USP, BP and EP standards. Every batch ships with a Certificate of Analysis (assay, identity, purity); MSDS and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Sodium sulfite?
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Sodium sulfite (CAS 7757-83-7), molecular formula Na2SO3, is a high-purity chemical supplied by Tech Serve Solutions for chemical synthesis applications, to USP, BP and EP standards.
What grades of Sodium sulfite does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Sodium sulfite in USP, BP, EP and reagent/AR grades. Custom specifications for nutraceutical or specialty pharmaceutical applications are available — contact our technical sales team.
What is the CAS number and molecular formula of Sodium sulfite?
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Sodium sulfite has CAS number 7757-83-7 and molecular formula Na2SO3. Full specifications appear in the table above and in the Certificate of Analysis.
What is the typical minimum order quantity and lead time for Sodium sulfite?
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Sample quantities are available for technical evaluation; bulk MOQ depends on grade and packaging. In-stock material typically ships in 7–10 working days; custom-spec orders take 3–4 weeks. Tech Serve Solutions ships worldwide with full export documentation.
Do you provide a Certificate of Analysis (CoA) with each shipment?
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Yes. Every batch of Sodium sulfite ships with a Certificate of Analysis covering assay, identity and purity tests, plus pharmacopoeia conformance where applicable. MSDS and TDS documents are available on request before order placement.
How should Sodium sulfite be stored?
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Store Sodium sulfite in its original sealed container in a cool, dry place away from direct sunlight and incompatible materials, in line with the storage guidance on the Safety Data Sheet. Reseal between dispensings.
What is Sodium sulfite used for?
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Sodium sulfite is used in chemical synthesis applications across pharmaceutical, research and industrial settings. Our technical team can advise on suitability for your specific process.
How do I request a quote for Sodium sulfite?
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Request a quote with your required grade, quantity and destination via https://www.techservesolutions.in/contact or email info@techservesolutions.in. We respond with specifications, a Certificate of Analysis and pricing.
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