Sodium disulfite - Ph.Eur., Premium-Grade Reagents, Suitable for Analysis, ACS , CAS No.7681-57-4

CAS: 7681-57-4 Cat. No.: S433805 Molecular Weight: 190.11 EC Number: 231-673-0
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GRADE & PURITY Ph.Eur. ? European Pharmacopoeia grade — conforms to Ph.Eur. monographs across EU member states. Use for pharmaceutical work needing European compendial compliance. Premium-Grade Reagents ? Premium-grade reagents with enhanced purity and tighter QC than standard grades. Use for demanding applications needing extra consistency. Suitable for Analysis ? Suitable-for-analysis grade — purity adequate for general analytical procedures. Use as a dependable analytical reagent across routine methods. ACS ? ACS grade — meets American Chemical Society specifications, the analytical benchmark in the US. Use for analytical and QC work needing ACS-defined purity.
Synonyms
Sodium metabisulfite, SO2 58.5% | Sodium bisulfite anhydrous | Sodium metabisulfite | sodium meta-bisulfite | Sodium pyrosulfite | UNII-4VON5FNS3C | EC 231-673-0 | SODIUM METABISULFITE [WHO-DD] | Sodium metabisulphite | Disodium metabisulfite | DISODIUM P
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Room temperature
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100g
S433805-100g
3
$24.90
500g
S433805-500g
1
$99.90
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Why this grade

Ph.Eur., Premium-Grade Reagents, Suitable for Analysis, ACS ACS,Ph.Eur.,Premium-Grade Reagents,Suitable for Analysis for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature Ships FedEx DG Service Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 42 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
Sodium metabisulfite, SO2 58.5% | Sodium bisulfite anhydrous | Sodium metabisulfite | sodium meta-bisulfite | Sodium pyrosulfite | UNII-4VON5FNS3C | EC 231-673-0 | SODIUM METABISULFITE [WHO-DD] | Sodium metabisulphite | Disodium metabisulfite | DISODIUM P
Specifications & Purity
Ph.Eur., Premium-Grade Reagents, Suitable for Analysis, ACS
Storage
Room temperature
Shipped In
FedEx DG Service
This product requires cold chain shipping. Ground and other economy services are not available.
Grade
ACS, Ph.Eur., Premium-Grade Reagents, Suitable for Analysis
Names and Identifiers
Canonical Smiles[O-]S(=O)S(=O)(=O)[O-].[Na+].[Na+]
InChIKeyHRZFUMHJMZEROT-UHFFFAOYSA-L
INCHI1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
Isomeric SMILES [O-]S(=O)S(=O)(=O)[O-].[Na+].[Na+]
WGK Germany 1
RTECS UX8225000
UN Number 3335
Packing Group III
Molecular Weight 190.11

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

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✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

Quick-reference summary of product specifications and applications.

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

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Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomInorganic compounds
SuperclassMixed metal/non-metal compounds
ClassAlkali metal oxoanionic compounds
SubclassAlkali metal dithionites
Intermediate Tree Nodes Not available
Direct ParentAlkali metal dithionites
Alternative Parents Inorganic sodium salts  Inorganic oxides  
Molecular FrameworkNot available
Substituents Alkali metal dithionite - Inorganic sodium salt - Inorganic oxide - Inorganic salt
DescriptionThis compound belongs to the class of inorganic compounds known as alkali metal dithionites. These are inorganic compounds in which the largest oxoanion is dithionite, and in which the heaviest atom not in an oxoanion is an alkali metal.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Mechanisms of Action
Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

11 results found

Lot NumberCertificate TypeDateItem
G2503527Certificate of AnalysisJun 17, 2025 S433805
G2503528Certificate of AnalysisJun 17, 2025 S433805
G2503529Certificate of AnalysisJun 17, 2025 S433805
G2503530Certificate of AnalysisJun 17, 2025 S433805
G2401060Certificate of AnalysisOct 30, 2023 S433805
K2313143Certificate of AnalysisOct 30, 2023 S433805
K2313145Certificate of AnalysisOct 30, 2023 S433805
K2313146Certificate of AnalysisOct 30, 2023 S433805
K2313147Certificate of AnalysisOct 30, 2023 S433805
K2411071Certificate of AnalysisOct 30, 2023 S433805
K2313144Certificate of AnalysisJul 07, 2023 S433805

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Chemical and Physical Properties
Solubility650g/L
Boil Point(°C)150°C
Melt Point(°C)>300 °C
Molecular Weight190.110 g/mol
XLogP3
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count6
Rotatable Bond Count0
Exact Mass189.898 Da
Monoisotopic Mass189.898 Da
Topological Polar Surface Area125.000 Ų
Heavy Atom Count9
Formal Charge0
Complexity136.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count3
Documents & Articles
Premium-Grade Reagents
What Is “Suitable for Analysis” Grade? A Practical Guide
Radical Initiator Selection Guide
A Practical Guide to Fragrance Compositions: Turning a Black-Box Formula into an Engineerable System—Compatibility, Stability, Controlled Release, Traceability, and Selection
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Plant Omics Panorama: Workflow Frameworks and Multi-Omics Integration from Genomics to Transcriptomics, Proteomics, and Metabolomics
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Citations of This Product
References
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