Arsenic acid

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A white translucent, crystalline compound. Arsenic acid is formed by the action of nitric or Sulfuric acid on Arsenic. It is used in glass manufacture, textile printing, and as a Wood preservative and Insecticide.

Synonyms and Related Terms

orthoarsenic acid; acid of arsenic

Physical and Chemical Properties

Soluble in water ethanol, alkali, glycerol.

Composition H3AsO4
CAS 7778-39-4
Melting Point 35.5 C
Density 2-2.5 g/ml
Molecular Weight mol. wt. = 141.94


  • Highly toxic by ingestion and inhalation.
  • Carcinogenic and mutagenic
  • NIH: Arsenic Acid

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 69
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 843