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Arsenic pentoxide Other names Arsenic(V) oxide Arsenic oxide Arsenic anhydride Identifiers CAS number 1303-28-2 Y PubChem 14771 ChemSpider 14088 Y EC number 215-116-9 RTECS number CG2275000 Jmol-3D images Image 1 SMILES O=[As](=O)O[As](=O)=O InChI InChI=1S/As2O5/c3-1(4)7-2(5)6 Y Key: COHDHYZHOPQOFD-UHFFFAOYSA-N Y InChI=1/As2O5/c3-1(4)7-2(5)6 Key: COHDHYZHOPQOFD-UHFFFAOYAN Properties Molecular formula As2O5 Molar mass 229.8402 g/mol Appearance white hygroscopic powder Density 4.32 g/cm3 Melting point 315 °C (decomposes) Solubility in water 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 EU classification Very toxic (T+) Carc. Cat. 1 Dangerous for the environment (N) R-phrases R45, R23/25, R50/53 S-phrases S53, S45, S60, S61 NFPA 704 0 4 0 LD50 8 mg/kg (rat, oral) Related compounds Other cations Phosphorus pentoxide Antimony pentoxide Related compounds Arsenic trioxide Arsenic acid  Y(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references 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] References ^ Martin Jansen (1977). "Crystal Structure of As2O5". Angewandte Chemie International Edition in English 16 (5): 314–315. doi:10.1002/anie.197703142.  ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419.  pp. 576-577 External links 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. (French) Linstrom, P.J.; Mallard, W.G. (eds.) NIST Chemistry WebBook, NIST Standard Reference Database Number 69. National Institute of Standards and Technology, Gaithersburg MD. http://webbook.nist.gov v · d · eArsenic compounds AsBr3 · AsCl3 · AsCl5 · AsF3 · AsF5 · AsH3 · AsI3 · As2O3 · As2O5 · As2S3 · As2S5 · As2Se3 · As4S4