Arsenic pentoxide

Arsenic pentoxide
Arsenic pentoxide
CAS number 1303-28-2 YesY
PubChem 14771
ChemSpider 14088 YesY
EC number 215-116-9
RTECS number CG2275000
Jmol-3D images Image 1
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
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
NFPA 704.svg
LD50 8 mg/kg (rat, oral)
Related compounds
Other cations Phosphorus pentoxide
Antimony pentoxide
Related compounds Arsenic trioxide
Arsenic acid
 YesY pentoxide (verify) (what is: YesY/N?)
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]


  1. ^ Martin Jansen (1977). "Crystal Structure of As2O5". Angewandte Chemie International Edition in English 16 (5): 314–315. doi:10.1002/anie.197703142. 
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419.  pp. 576-577

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  • arsenic pentoxide — arseno(V) oksidas statusas T sritis chemija formulė As₂O₅ atitikmenys: angl. arsenic acid anhydride; arsenic pentoxide; arsenic(V) oxide rus. мышьяка(V) оксид; мышьяковый ангидрид ryšiai: sinonimas – diarseno pentoksidas …   Chemijos terminų aiškinamasis žodynas

  • arsenic pentoxide — noun : a white amorphous deliquescent compound As2O5 or As4O10 usually made by oxidizing arsenic trioxide and used in making arsenates …   Useful english dictionary

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  • Arsenic — (pronEng|ˈɑrsənɪk) is a chemical element that has the symbol As and atomic number of 33. Arsenic was first documented by Albertus Magnus in 1250cite book |last=Emsley |first=John |title=Nature s Building Blocks: An A Z Guide to the Elements |year …   Wikipedia

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  • arsenic — n. /ahr seuh nik, ahrs nik/; adj. /ahr sen ik/, n. 1. a grayish white element having a metallic luster, vaporizing when heated, and forming poisonous compounds. Symbol: As; at. wt.: 74.92; at. no.: 33. 2. See arsenic trioxide. 3. a mineral, the… …   Universalium

  • arsenic acid — ar·sen·ic acid är .sen ik n any of three arsenic containing acids that are analogous to the phosphoric acids * * * ar·sen·ic ac·id (ahr senґik) the hydrate, H3AsO4, of arsenic pentoxide, which is itself also referred to as arsenic acid …   Medical dictionary

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