Maleic acid potassium salt
Potassium hydrogen maleate (CAS 689-82-7) is an organic salt with the formula C4H3O4K and a molecular weight of 154.16 g/mol. This white crystalline solid functions as a key intermediate and building block in organic synthesis. It is widely utilized in chemical manufacturing processes where its specific reactivity is leveraged for creating more complex molecules. Its applications span various sectors requiring precise organic chemical precursors.
- IUPAC
- cis-Butenedioic acid,Potassium hydrogen maleate,Toxilic acid
- Synonyms
- Potassium hydrogen maleatecis-Butenedioic acid,Potassium hydrogen maleateToxilic acid

Organic Synthesis Intermediate
Potassium hydrogen maleate serves as a versatile building block in the synthesis of various organic compounds. Its structure allows for controlled chemical transformations, making it valuable in multi-step synthesis pathways.
Chemical Manufacturing
This compound is employed in the production of fine chemicals and specialised organic materials. Its consistent quality and defined reactivity make it a reliable choice for industrial chemical processes.
Research and Development
In laboratory settings, potassium hydrogen maleate is used in research to explore new synthetic routes and develop novel chemical entities. It is a useful reagent for academic and industrial R&D.
| Molecular weight | 154.16 |
|---|---|
| Linear formula | C4H3O4K |
| Assay | ≥99% |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
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 Hydrogen Maleate used for?
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Potassium hydrogen maleate (CAS 689-82-7) is primarily used as an intermediate and building block in organic synthesis and chemical manufacturing processes.
What is the CAS number and formula for Potassium Hydrogen Maleate?
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The CAS number is 689-82-7 and the chemical formula is C4H3O4K.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Potassium Hydrogen Maleate with an assay of ≥99%. We do not represent this product as USP, BP, or EP grade unless explicitly stated in product documentation.
How should Potassium Hydrogen Maleate be handled safely?
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Potassium Hydrogen Maleate is classified as a Warning substance (GHS07) and may cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Handle with appropriate personal protective equipment including a dust mask (type N95 US), eyeshields, and gloves. Ensure good ventilation.
Does Tech Serve Solutions export this chemical?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Potassium Hydrogen Maleate.
How can I request a quote or sample?
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To request a quote or a sample of Potassium Hydrogen Maleate, please contact our sales team through the website or by phone.
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