Potassium disulfite
Potassium disulfite (CAS: 16731-55-8), with the chemical formula K2S2O5, is an inorganic salt serving as a versatile reagent. Its primary function lies in its reducing properties and as a source of sulfur dioxide. It is widely employed in chemical synthesis and as an essential component in various industrial processes where its specific chemical reactivity is required. Supplied by Tech Serve Solutions, it meets stringent quality standards for laboratory and industrial applications.
- IUPAC
- Potassium metabisulfite,Potassium pyrosulfite

Chemical Synthesis
Potassium disulfite acts as a reducing agent and a source of sulfur dioxide in organic and inorganic synthesis. It is valuable for introducing sulfur functionalities or for controlling redox reactions in various synthetic pathways.
Industrial Processes
This compound finds application in industrial settings where its properties as a preservative or a bleaching agent are beneficial. It is also used in water treatment and as a component in photographic developers.
Laboratory Reagent
As a common laboratory chemical, Potassium disulfite is used for analytical purposes and in research and development activities. Its well-defined chemical properties make it a reliable reagent for various experimental setups.
| Molecular weight | 222.32 |
|---|---|
| Linear formula | K2S2O5 |
| Assay | 98% |

Hazard statements
- H318Causes serious eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 31-41 |
| Safety statements (S) | 26-39 |
| Supplemental hazards | Contact with acids liberates toxic gas. |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets 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 Potassium disulfite used for?
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Potassium disulfite (CAS: 16731-55-8) is used in chemical synthesis as a reducing agent and a source of sulfur dioxide, and in various industrial applications such as preservation, bleaching, and water treatment.
What are the CAS number and formula for Potassium disulfite?
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The CAS number for Potassium disulfite is 16731-55-8 and its chemical formula is K2S2O5.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Potassium disulfite with an assay of 98%. We do not represent this product as USP, BP, or EP grade; it is supplied for technical and research purposes.
How should Potassium disulfite be handled safely?
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Potassium disulfite presents hazards including serious eye damage (H318) and liberates toxic gas upon contact with acids. Handle with a dust mask (N95), eyeshields, gloves, and ensure good ventilation. Avoid contact with acids.
How is Potassium disulfite packed and shipped?
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Potassium disulfite is carefully packed to ensure safe transit and is exported globally by Tech Serve Solutions, adhering to all relevant shipping regulations for chemical products.
How can I request a quote or sample for Potassium disulfite?
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To request a quote or a sample of Potassium disulfite, please contact our sales team through the website or by phone, providing your specific requirements.
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