Molekula
Arsenic (III) oxide - Secondary standard
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Arsenic (III) oxide is a highly toxic inorganic compound primarily used as a secondary analytical standard for calibration in laboratories, as well as in the production of pesticides, glass, and semiconductors. It is a white, odorless powder with high purity requirements for precise chemical analysis. This secondary standard has a CAS number of 1327-53-3, a molecular formula of As₂O₃, and a molecular weight of 197.8414 g/mol. It must be stored at ambient conditions and handled with extreme caution, as it carries a **Danger** signal word due to its acute toxicity. Molekula supplies Arsenic (III) oxide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White to grey solid |
| Purity | ≥ 99.0% |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | II |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White cubic crystals (Arsenolite) |
| Odour | Odorless |
| Melting Point | 313 °C (claudetite); 274 °C (arsenolite) |
| Boiling Point | 460 °C |
| Density | 3.7-4.2 (relative, water = 1) |
| Water Solubility | 17 g/L at 16 °C |
| Solubility (other solvents) | Soluble in glycerol |
| Vapour Pressure | 2.47 × 10⁻⁴ mmHg at 25 °C |
| Refractive Index | 1.755 |
Source: PubChem CID 14888 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 90035141 |
| CAS Number | 1327-53-3 |
| IUPAC Name | bis(arsenic(3+));tris(oxygen(2-)) |
| EC Number | 215-481-4 |
| Molecular Formula | As2O3 |
| Molecular Weight | 197.8414 |
| Exact Mass | 197.8279 |
| SMILES | [O-2].[O-2].[O-2].[As+3].[As+3] |
| InChIKey | QTLQKAJBUDWPIB-UHFFFAOYSA-N |
| InChI | InChI=1S/2As.3O/q2*+3;3*-2 |
| PubChem CID | 14888 |
| UN Number | UN1561 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28112910 |
| Tariff Code | 2811291010 |
Safety & GHS
-
Corrosive
GHS05
-
Toxic
GHS06
-
Serious Health Hazard
GHS08
-
Hazardous to the Environment
GHS09
Hazard statements
- H300 +H310 + H330 Fatal if swallowed, in contact with skin or if inhaled
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H350 May cause cancer
- H360 May damage fertility or the unborn child
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P202 Do not handle until all safety precautions have been read and understood
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acide arsenieux
- Arseni trioxydum
- Arsenic blanc
- Arsenic oxide (As2O3)
- Arsenigen saure
- Arsenious Acid Anhydride
- Arsenious trioxide
- Claudetite
- Oxyde Arsenieux
- Trixenox
Frequently asked questions
What is Arsenic (III) oxide used for as a secondary standard?
Arsenic (III) oxide is primarily used as a secondary standard for analytical calibration in techniques like atomic absorption spectroscopy (AAS) and inductively coupled plasma (ICP) due to its high purity and stability.
What is the chemical formula and molecular weight of Arsenic (III) oxide?
The chemical formula is **As₂O₃**, and the molecular weight is **197.8414 g/mol**.
How should Arsenic (III) oxide be stored?
Store in a tightly sealed container at **ambient temperature**, away from moisture and incompatible substances.
What grade of Arsenic (III) oxide is available?
Molekula supplies Arsenic (III) oxide as a **secondary standard grade**, meeting high-purity requirements for analytical applications.
Can Molekula supply Arsenic (III) oxide in bulk quantities?
Yes, bulk quantities are available upon request—please contact our sales team for pricing and lead times.
What documentation comes with an order of Arsenic (III) oxide?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.