Arsenic pentoxide: Difference between revisions
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==Synthesis and reactions== |
==Synthesis and reactions== |
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Arsenic pentoxide can be crystallized by heating As<sub>2</sub>O<sub>3</sub> under oxygen. In fact, arsenic pentoxide decomposes to oxygen and As<sub>2</sub>O<sub>3</sub> upon heating.<ref>{{cite journal | author = Martin Jansen | title = Crystal Structure of As<sub>2</sub>O<sub>5</sub> | year = 1977 | journal = Angewandte Chemie International Edition in English | volume = 16 | issue = 5 | pages = 314–315 | doi = 10.1002/anie.197703142}}</ref> |
Arsenic pentoxide can be crystallized by heating As<sub>2</sub>O<sub>3</sub> under oxygen. In fact, arsenic pentoxide decomposes to oxygen and As<sub>2</sub>O<sub>3</sub> upon heating.<ref name = "Jansen">{{cite journal | author = Martin Jansen | title = Crystal Structure of As<sub>2</sub>O<sub>5</sub> | year = 1977 | journal = Angewandte Chemie International Edition in English | volume = 16 | issue = 5 | pages = 314–315 | doi = 10.1002/anie.197703142}}</ref> |
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As<sub>2</sub>O<sub>5</sub>, which like [[phosphorus pentoxide]] is [[hygroscopic]], dissolves readily in water to form [[arsenic acid]], H<sub>3</sub>AsO<sub>4</sub>.<ref>{{Greenwood&Earnshaw}} pp. 576-577</ref> |
As<sub>2</sub>O<sub>5</sub>, which like [[phosphorus pentoxide]] is [[hygroscopic]], dissolves readily in water to form [[arsenic acid]], H<sub>3</sub>AsO<sub>4</sub>.<ref name="Greenwood">{{Greenwood&Earnshaw}} pp. 576-577</ref> and is a strong oxidising agent reacting with HCl to form Cl<sub>2</sub>.<ref name="Greenwood"/> |
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==Structure== |
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The structure consists of tetrahedral {AsO<sub>4</sub>} and octahedral {AsO<sub>6</sub>} centres linked by sharing corners.<ref name = "Jansen"/> |
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==References== |
==References== |
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Revision as of 15:19, 1 March 2013
Template:Chembox Other
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| Names | |
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| Other names
Arsenic(V) oxide
Arsenic oxide Arsenic anhydride | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.013.743 |
| EC Number |
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PubChem CID
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| RTECS number |
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CompTox Dashboard (EPA)
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| Properties | |
| As2O5 | |
| Molar mass | 229.8402 g/mol |
| Appearance | white hygroscopic powder |
| Density | 4.32 g/cm3 |
| Melting point | 315 °C (decomposes) |
| 59.5 g/100 mL (0 °C) 65.8 g/100 mL (20 °C) 8.20 g/100 mL (100 °C) | |
| Solubility | soluble in alcohol |
| Acidity (pKa) | 7 |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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8 mg/kg (rat, oral) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Arsenic pentoxide is the inorganic compound with the formula As2O5. This glassy, white solid is relatively unstable, consistent with the rarity of the As(V) oxidation state. More common, and far more important commercially, is arsenic(III) oxide (As2O3).
Synthesis and reactions
Arsenic pentoxide can be crystallized by heating As2O3 under oxygen. In fact, arsenic pentoxide decomposes to oxygen and As2O3 upon heating.[1]
As2O5, which like phosphorus pentoxide is hygroscopic, dissolves readily in water to form arsenic acid, H3AsO4.[2] and is a strong oxidising agent reacting with HCl to form Cl2.[2]
Structure
The structure consists of tetrahedral {AsO4} and octahedral {AsO6} centres linked by sharing corners.[1]
References
- ^ a b Martin Jansen (1977). "Crystal Structure of As2O5". Angewandte Chemie International Edition in English. 16 (5): 314–315. doi:10.1002/anie.197703142.
- ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8. pp. 576-577
External links
- NIOSH Pocket Guide to Chemical Hazards
- IARC Monograph – Arsenic and Arsenic Compounds
- NTP Report on Carcinogens – Inorganic Arsenic Compounds
- ESIS: European chemical Substances Information System
- Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD)