Back أكسيد الزرنيخ الخماسي Arabic پناوکسید آرسنیک AZB Oxid arseničný Czech Arsen(V)-oxid German Πεντοξείδιο του αρσενικού Greek Óxido de arsénico(V) Spanish پنتاکسید آرسنیک Persian Arseenipentoksidi Finnish Pentoxyde d'arsenic French Arzén-pentoxid Hungarian

Arsenic pentoxide

Diarsenic pentoxide
Arsenic pentoxide
Names
Other names
Arsenic(V) oxide
Neutral arsenic oxide (2:5)
Arsenic anhydride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.743 Edit this at Wikidata
EC Number
  • 215-116-9
RTECS number
  • CG2275000
UNII
UN number 1559
  • InChI=1S/As2O5/c3-1(4)7-2(5)6 checkY
    Key: COHDHYZHOPQOFD-UHFFFAOYSA-N checkY
  • InChI=1/As2O5/c3-1(4)7-2(5)6
    Key: COHDHYZHOPQOFD-UHFFFAOYAN
  • O=[As](=O)O[As](=O)=O
Properties
As2O5
Molar mass 229.8402 g/mol
Appearance white hygroscopic powder
Density 4.32 g/cm3
Melting point 315 °C (599 °F; 588 K) (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
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H301, H331, H350, H410
P201, P202, P261, P264, P270, P271, P273, P281, P301+P310, P304+P340, P308+P313, P311, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
4
0
0
Lethal dose or concentration (LD, LC):
8 mg/kg (rat, oral)
NIOSH (US health exposure limits):
PEL (Permissible)
 [1910.1018] TWA 0.010 mg/m3[1]
REL (Recommended)
 Ca C 0.002 mg/m3 [15-minute][1]
IDLH (Immediate danger)
 Ca [5 mg/m3 (as As)][1]
Related compounds
Other cations
 Phosphorus pentoxide
Antimony pentoxide
Related compounds
 Arsenic trioxide
Arsenic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Arsenic pentoxide is the inorganic compound with the formula As2O5.[2] This glassy, white, deliquescent 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). All inorganic arsenic compounds are highly toxic and thus find only limited commercial applications.

  1. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0038". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
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