5-Nitrobarbituric acid hydrate
5-Nitrobarbituric acid hydrate (CAS: 209529-81-7) is a chemical compound with the formula C4H3N3O5 · xH2O. Possessing a molecular weight of 173.08 on an anhydrous basis, this substance is primarily recognised for its utility as a microreagent. It is employed in analytical chemistry for the specific detection and precipitation of potassium ions, forming a characteristic precipitate. Its heterocyclic pyrimidine structure also lends itself to broader applications in chemical synthesis.
- IUPAC
- 5-Nitro-2,4,6-trihydroxypyrimidine,Dilituric Acid
- Synonyms
- Dilituric Acid, 5-Nitro-2,4,6-trihydroxypyrimidine

Potassium Microreagent
Utilised as a specific microreagent in qualitative and quantitative analysis for the detection of potassium ions. It forms a characteristic precipitate with potassium, aiding in its identification.
Chemical Synthesis
Serves as a building block in organic synthesis, particularly within the realm of heterocyclic chemistry. Its pyrimidine core can be incorporated into more complex molecular structures.
Research and Development
A valuable reagent for laboratory research, supporting investigations in analytical methods and synthetic organic chemistry. Its specific reactivity makes it useful for targeted chemical studies.
| Molecular weight | 173.08 (anhydrous basis) |
|---|---|
| Empirical formula | C4H3N3O5 · xH2O |
| Assay | 95% |
| Application | Used as a microreagent for potassium with which it forms a characteristic precipitate. |
| Melting point | 183 °C (dec.)(lit.) |

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 5-Nitrobarbituric acid hydrate used for?
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5-Nitrobarbituric acid hydrate is used as a microreagent for the detection of potassium ions, with which it forms a characteristic precipitate. It also finds application as a building block in chemical synthesis and for research purposes.
What are the CAS number and chemical formula for 5-Nitrobarbituric acid hydrate?
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The CAS number for 5-Nitrobarbituric acid hydrate is 209529-81-7, and its chemical formula is C4H3N3O5 · xH2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Nitrobarbituric acid hydrate with an assay of 95%. This product is supplied for research and laboratory use. Tech Serve Solutions does not represent this product as USP, BP, EP, or other pharmacopoeia grades.
What are the safety considerations when handling 5-Nitrobarbituric acid hydrate?
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5-Nitrobarbituric acid hydrate is classified as a Warning substance, with hazard statements H315 (Causes skin irritation), H319 (Causes serious eye irritation), and H335 (May cause respiratory irritation). Appropriate personal protective equipment, including a dust mask type N95, eyeshields, and gloves, should be used. Ensure adequate ventilation.
How is 5-Nitrobarbituric acid hydrate packed and shipped?
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Products are packed according to industry best practices for chemical reagents, ensuring safe transport and storage. Tech Serve Solutions is experienced in global export procedures for fine chemicals.
How can I request a quote or sample for 5-Nitrobarbituric acid hydrate?
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To request a quote or a sample of 5-Nitrobarbituric acid hydrate, please contact our sales team through the website or by phone. Please specify the required quantity and your delivery location.
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