Sodium Arsenate, Dibasic
Structural Formula Vector Image
Title: Sodium Arsenate, Dibasic
CAS Registry Number: 7778-43-0
Additional Names: Disodium arsenate
Molecular Formula: AsHNa2O4
Molecular Weight: 185.91
Percent Composition: As 40.30%, H 0.54%, Na 24.73%, O 34.42%
Line Formula: Na2HAsO4
Literature References: Toxicity study: Franke, Moxon, J. Pharmacol. Exp. Ther. 58, 454 (1936). Review of toxicology and human exposure: Toxicological Profile for Arsenic (PB2000-108021, 2000) 468 pp.
Properties: Powder. Very sol in water; slightly sol in alcohol.
Derivative Type: Heptahydrate
Properties: Odorless crystals; effloresces in warm air. Poisonous, but less so than the arsenite. Loses 5 H2O (29%) at about 50°; becomes anhydr at 100°. At 150° or higher it is converted into pyroarsenate. d 1.87. mp 57° when rapidly heated. Sol in 1.3 parts water; sol in glycerol, slightly in alcohol. The aq soln is alkaline to litmus. LD75 i.p. in rats: 14-18 mg As/kg (Franke, Moxon).
Melting point: mp 57° when rapidly heated
Density: d 1.87
Toxicity data: LD75 i.p. in rats: 14-18 mg As/kg (Franke, Moxon)
Use: The technical grade, about 98% pure, is used in dyeing with Turkey-red oil and in printing fabrics; manuf of other arsenates.
Therap-Cat: Formerly as antimalarial; dermatologic.
Therap-Cat-Vet: Has been used in parasitism (internally and externally), also for nonparasitic skin and blood diseases, in rheumatism, asthma and heaves, and as an alterative.
Keywords: Antimalarial.

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