Pyrosulfurous Acid

About Pyrosulfurous Acid

Pyrosulfurous Acid is an inorganic reagent carrying the CAS registry number 33669-61-3. Formula H2O5S2, molecular weight 146.15 g/mol. Common synonyms include disulfurous acid and Metasulfurous Acid.

Keep the container tightly sealed and store it in a cool, dry area. Good laboratory practice and suitable PPE are recommended during handling.

Typical applications include materials research and chemical synthesis. Buyers come mainly from academic and industrial research.

We offer Pyrosulfurous Acid in 10 mg, 25 mg, 50 mg and 100 mg packs with a batch-specific COA, and ship to customers worldwide. A Safety Data Sheet (SDS) and technical specifications are available on request. Custom pack sizes, bulk quantities and specific analytical data can be arranged on request. Export shipments are packed to international standards with the required transport documentation.

Typical applications

Materials research
Chemical synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Pyrosulfurous Acid
Catalogue No.	VQ-016038
CAS Number	33669-61-3
Other CAS	7681-57-4, 16731-55-8
Molecular formula	H₂O₅S₂
Molecular weight	146.15 g/mol
Exact mass	145.9344
Grade	Reference Standard
InChIKey	WBZKQQHYRPRKNJ-UHFFFAOYSA-N
SMILES	OS(=O)S(=O)(=O)O
PubChem CID	28020

Physical properties
Physical form	Other
LogP (XLogP3)	-1.4
H-bond donors / acceptors	2 / 6
TPSA	119 Å²
Synonyms	disulfurous acid, Metasulfurous Acid, H2S2O5, Sulfinosulfonic acid, Hydroxy(oxo)-lambda~4~-sulfanesulfonic acid, dihydroxido-1kappaO,2kappaO-trioxido-1kappa(2)O,2kappaO-disulfur(S--S)

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Pyrosulfurous Acid?

The CAS Registry Number of Pyrosulfurous Acid is 33669-61-3. It is also known as disulfurous acid, Metasulfurous Acid, H2S2O5.

What is the molecular formula and molecular weight of Pyrosulfurous Acid?

Pyrosulfurous Acid has the molecular formula H2O5S2 and a molecular weight of 146.15 g/mol.

Which grade and pack sizes of Pyrosulfurous Acid can I order?

We supply Pyrosulfurous Acid in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Pyrosulfurous Acid?

Yes. Every lot of Pyrosulfurous Acid is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Pyrosulfurous Acid be shipped internationally?

Yes. We export Pyrosulfurous Acid worldwide by air and sea freight or express courier, on EXW, FOB, CIF, CFR or DAP Incoterms, with full export documentation.