Arsenic pentoxide

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Arsenic pentoxide
Arsenic pentoxide
General
Other names Arsenic(V) oxide
Arsenic oxide
Arsenic anhydride
Molecular formula As2O5
Molar mass 229.8 g/mol
Appearance white hygroscopic 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
Melting point 315 °C (decomposes)
Boiling point
Acidity (pKa)
Basicity (pKb)
Structure
Molecular shape
Crystal structure
Dipole moment
Thermodynamic data
Standard enthalpy
of formation ΔfHosolid
Standard molar entropy
Sosolid
Hazards
MSDS External MSDS
EU classification Very toxic (T+)
Carc. Cat. 1
Dangerous for the
environment (N)
NFPA 704

0
3
2
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
Spectral data UV, IR, NMR, MS
Related compounds
Other anions
Other cations Phosphorus pentoxide
Antimony pentoxide
Related compounds Arsenic trioxide
Arsenic acid
Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references

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.It is used in poison and lasers.

[edit] Bibliography

Arsenic: Medical and Biological Effects of Environmental Pollutants (1977)

[edit] External links

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