Arsenic pentoxide

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White deliquescent crystals that are highly toxic. Arsenic pentoxide is used in insecticides, fungicides, textile dyeing and printing, and in glass manufacturing.

Synonyms and Related Terms

arsenic (V) oxide; arsenic anhydride; arsenic acid anhydride

Chemical structure

Arsenic pentoxide.jpg


Highly toxic by ingestion and inhalation. Potential carcinogen and mutagen.

Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water, ethanol.

Composition As2O5
CAS 1303-28-2
Melting Point 315
Density 4.086
Molecular Weight mol. wt. = 229.84

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 839