Arsenic trichloride

Arsenic trichloride is an inorganic compound with the formula AsCl3, also known as arsenous chloride or butter of arsenic. This poisonous oil is colourless, although impure samples may appear yellow. It is an intermediate in the manufacture of organoarsenic compounds.

Arsenic trichloride
Names
Other names
Arsenic(III) chloride, Arsenous trichloride, Arsine trichloride, Butter of arsenic, de Valagin's solution, Trichloroarsine
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.144
EC Number
  • 232-059-5
PubChem CID
RTECS number
  • CG1750000
UNII
UN number 1560
  • InChI=1S/AsCl3/c2-1(3)4 Y
    Key: OEYOHULQRFXULB-UHFFFAOYSA-N Y
  • InChI=1/AsCl3/c2-1(3)4
    Key: OEYOHULQRFXULB-UHFFFAOYAG
SMILES
  • Cl[As](Cl)Cl
Properties
AsCl3
Molar mass 181.28 g/mol
Appearance colourless oily liquid
Density 2.163 g/cm3, liquid
Melting point −13 °C (9 °F; 260 K)
Boiling point 181 °C (358 °F; 454 K)
Hydrolyzes
Solubility soluble in alcohol, ether, HCl, HBr, chloroform, CCl4
Magnetic susceptibility (χ)
 -79.9·10−6 cm3/mol
Refractive index (nD)
 1.6006
Viscosity 9.77 x 10−6 Pa s
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Very toxic, carcinogen, corrosive, decomposes on contact with water releasing HCl
GHS labelling:
Danger
H301, H310, H314, H331, H350, H410
P201, P202, P260, P261, P262, P264, P270, P271, P273, P280, P281, P301+P310, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P310, P311, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
4
0
1
Lethal dose or concentration (LD, LC):
LD50 (median dose)
 48 mg/kg
LCLo (lowest published)
 100 mg/m3 (cat, 1 hr)
200 mg/m3 (cat, 20 min)
338 ppm (rat, 10 min)
NIOSH (US health exposure limits):
PEL (Permissible)
 [1910.1018] TWA 0.010 mg/m3
REL (Recommended)
 Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)
 Ca [5 mg/m3 (as As)]
Related compounds
Other anions
 Arsenic trioxide, Arsenic trifluoride
Other cations
 Antimony trichloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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