Arsenic pentoxide
From Wikipedia, the free encyclopedia
| Arsenic pentoxide | ||
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| General | ||
| Other names | Arsenic(V) oxide Arsenic oxide Arsenic anhydride |
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| Molecular formula | As2O5 | |
| Molar mass | 229.8 g/mol | |
| Appearance | white hydroscopic powder | |
| CAS number | [1303-28-2] | |
| EINECS number | 033-004-00-6 | |
| Properties | ||
| Density and phase | 4.3 g/cm3, solid | |
| Solubility | 65.8 g/100 ml (20 °C) in water soluble in alcohol |
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| Melting point | 315 °C (decomposes) | |
| Boiling point | ||
| Acidity (pKa) | ||
| Basicity (pKb) | ||
| Structure | ||
| Molecular shape | ||
| Crystal structure | ||
| Dipole moment | ||
| Thermodynamic data | ||
| Standard enthalpy of formation ΔfH |
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| Standard molar entropy S |
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| Hazards | ||
| MSDS | External MSDS | |
| EU classification | Very toxic (T+) Carc. Cat. 1 Dangerous for the environment (N) |
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| NFPA 704 |
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| R-phrases | R45, R23/25, R50/53 | |
| S-phrases | S53, S45, S60, S61 | |
| Supplementary data page | ||
| Structure and properties |
n, εr, etc. | |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
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| Spectral data | UV, IR, NMR, MS | |
| Related compounds | ||
| Other anions | ||
| Other cations | Phosphorus pentoxide Antimony pentoxide |
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| Related compounds | Arsenic trioxide Arsenic acid |
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| Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references |
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Arsenic pentoxide is an important commercial compound of arsenic, with similar usage as arsenic trioxide for arsenic chemistry.
Contents |
[edit] Preparation
- Burn elemental arsenic in surplus of oxygen
- Oxidation of arsenic trioxide with nitric acid
[edit] Crystal structure
[edit] Chemical properties
Arsenic pentoxide is produced by oxidising arsenic trioxide with oxidizing agents such as ozone, hydrogen peroxide and nitric acid. Arsenic pentoxide decompose to oxygen and As2O3 upon heating. As2O5 dissolve readily in water to form arsenic (V) acid.
[edit] Uses
Similar to arsenic trioxide.
[edit] Toxicology
Similar to arsenic trioxide.
- See also: arsenicosis.
[edit] Bibliography
Arsenic: Medical and Biological Effects of Environmental Pollutants (1977)
[edit] External links
- International Chemical Safety Card 0377
- NIOSH Pocket Guide to Chemical Hazards
- IARC Monograph – Arsenic and Arsenic Compounds
- NTP Report on Carcinogens – Inorganic Arsenic Compounds
- European Chemicals Bureau
- Institut national de recherche et de sécurité (1992). "Arsenic et composés minéraux." Fiche toxicologique n° 192. Paris:INRS. (PDF file, in French)
- NIST Chemistry WebBook
