Title: Arsenic Acid

CAS Registry Number: 7778-39-4

Additional Names: Orthoarsenic acid

Molecular Formula: AsH3O4

Molecular Weight: 141.94

Percent Composition: As 52.78%, H 2.13%, O 45.09%

Line Formula: H3AsO4

Literature References: Exists only as the hemihydrate. Excessive drying produces As2O5.5/3H2O. Conveniently prepd from As2O3 and HNO3: Simon, Thaler, Z. Anorg. Allg. Chem. 161, 143 (1927); 246, 19 (1941). Toxicity study: Joachimoglu, Biochem. Z. 70, 144 (1915). Review of toxicology and human exposure: Toxicological Profile for Arsenic (PB2000-108021, 2000) 468 pp.

 

Derivative Type: Hemihydrate

Properties: Hygroscopic crystals. Poisonous! Converted to As2O5 by heating above 300°. Freely sol in water, alcohol, glycerol. LD50 i.v. in rabbits: 6 mg/kg (Joachimoglu).

Toxicity data: LD50 i.v. in rabbits: 6 mg/kg (Joachimoglu)

 

Use: In the manuf of arsenates.