Nomenclature
CAS number: 7784-34-1
Arsenous trichloride; butter of arsenic; fuming liquid arsenic.
AsCl
3; mol wt 181.28.
As 41.33%, Cl 58.67%.
Description and references
Prepn: Smith, Ind. Eng. Chem. 11, 109 (1919); Reisener in Ullmanns Encyklopdie der technischen
Chemie vol. 3, (Urban & Schwarzenberg,
Munich, 1953) p 850; Schenk in Handbook of
Preparative Inorganic Chemistry vol. 1, G.
Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 596.
Properties
Oily liquid. Poisonous. Fumes in air. d425 2.1497. mp 16°. bp 130.21°; bp11 25°. Dipole moment: 2.17. Heat of vaporization 8.9 kcal/mol.
Specific heat: 3.19 cal/mol/°C. nD20 1.6006.
Dec by water to form As(OH)3 and HCl. One mol AsCl3 can be dissolved in 9 mols H2O, this soln (d 1.53) may be diluted
again with another 9 mols H2O giving a soln with d 1.346. Further dilution
results in the precipitation of As2O3. Also
dec by ultraviolet light. Miscible with, or solvent for, chloroform,
carbon tetrachloride, ether, iodine, phosphorus, sulfur, alkali iodides,
oils and fats.Use
In the ceramic industry; in syntheses of chlorine-contg
arsenicals, e.g., chloro derivs of arsine.