Arsenic pentoxide

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Arsenic pentoxide

Other names	Arsenic(V) oxide Arsenic oxide Arsenic anhydride
Identifiers
CAS number	[1303-28-2]
EINECS number	033-004-00-6
Properties
Molecular formula	As₂O₅
Molar mass	229.8 g/mol
Appearance	white hygroscopic powder
Density	4.3 g/cm³, solid
Melting point	315 °C (decomposes)
Hazards
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
Related compounds
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, As₂O₅, is an important commercial compound of arsenic. Its usage with respect to arsenic chemistry, as well as its toxicology are similar to arsenic trioxide, As₂O₃.

1 Synthesis
2 Reactions
3 Bibliography
4 References
5 External links

[edit] Synthesis

Arsenic pentoxide can be synthesized either by burning elemental arsenic in surplus of oxygen, or by oxidizing arsenic trioxide with oxidizing agents such as ozone, hydrogen peroxide and nitric acid.^{[citation needed]}

[edit] Reactions

Arsenic pentoxide decomposes to oxygen and As₂O₃ upon heating.^[1] As₂O₅ dissolves readily in water to form arsenic acid, H₃AsO₄.^[2]

[edit] Bibliography

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

[edit] References

^ Martin Jansen (1977). "Crystal Structure of As₂O₅". Angewandte Chemie International Edition in English 16 (5): 314–315. doi:10.1002/anie.197703142.
^ Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4. pp. 576-577