Arsenic(V) oxide
Arsenic(V) oxide (CAS: 1303-28-2), with the formula As2O5 and a molecular weight of 229.84 g/mol, is a compound primarily employed in chemical synthesis and inorganic chemistry. It serves as a precursor in various chemical reactions and is recognised for its role in catalytic processes. Tech Serve Solutions supplies Arsenic(V) oxide with a minimum assay of 99%, suitable for research and industrial applications where high purity is essential.
- IUPAC
- Arsenic pentoxide

Chemical Synthesis
Arsenic(V) oxide functions as a reagent or intermediate in the synthesis of various arsenic-containing compounds. Its reactivity allows for its incorporation into complex molecular structures.
Inorganic Chemistry
This compound is utilised in inorganic chemistry research for studying oxidation states and the properties of arsenic oxides. It can be used in the preparation of other inorganic arsenic salts and complexes.
Catalysis
Arsenic oxides, including Arsenic(V) oxide, can act as catalysts or catalyst precursors in specific industrial chemical processes. Their behaviour in catalytic cycles is an area of ongoing research.
| Molecular weight | 229.84 |
|---|---|
| Linear formula | As2O5 |
| Assay | 99% |
| Melting point | >300 °C(lit.) |



Hazard statements
- H301Toxic if swallowed
- H331Toxic if inhaled
- H350May cause cancer
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P201Obtain special instructions before use
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P301IF SWALLOWED
- P311Call a POISON CENTER or doctor
- P501Dispose of contents and container per local regulations
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1559 6.1 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 45-23/25-50/53 |
| Safety statements (S) | 53-45-60-61 |
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 Arsenic(V) oxide used for?
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Arsenic(V) oxide is primarily used in chemical synthesis and inorganic chemistry, often serving as a precursor or reagent in the preparation of other arsenic compounds and in catalytic applications.
What are the CAS number and formula for Arsenic(V) oxide?
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The CAS number for Arsenic(V) oxide is 1303-28-2, and its chemical formula is As2O5.
What grade and purity does Tech Serve Solutions supply for Arsenic(V) oxide?
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Tech Serve Solutions supplies Arsenic(V) oxide with an assay of 99%. We do not represent this product as USP, BP, or EP grade.
How should Arsenic(V) oxide be handled and stored?
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Arsenic(V) oxide is a dangerous substance requiring careful handling. It is toxic if swallowed or inhaled, is suspected of causing cancer, and is very toxic to aquatic life with long-lasting effects. Always use appropriate personal protective equipment, including eyeshields, face shields, gloves, and a suitable respirator, and ensure good ventilation. Store in a well-ventilated place, away from incompatible materials, and follow all recommended safety precautions (P201, P261, P273, P301 + P310, P311, P501).
Is Arsenic(V) oxide a controlled substance?
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Arsenic(V) oxide is classified with hazard codes T (Toxic) and N (Dangerous for the environment) in Europe, with associated risk statements R45 (May cause cancer), R23/25 (Toxic by inhalation and if swallowed), and R50/53 (Very toxic to aquatic life with long-lasting effects). It is shipped under UN 1559, Hazard Class 6.1, Packing Group II. Consult relevant national regulations for specific control statuses.
How can I request a quote or sample of Arsenic(V) oxide?
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To request a quote or sample of Arsenic(V) oxide, please contact our sales department through the website or by phone, providing your specific requirements and shipping details.
How is Arsenic(V) oxide packed and exported?
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Arsenic(V) oxide is packed and exported in compliance with international regulations for hazardous materials, including UN 1559 classification for transport. Specific packaging details can be provided upon request.
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