Discover

Arsenic trichloride
Ball-and-stick model of arsenic trichloride
General
Other names	Arsenic(III) chloride butter of arsenic
Molecular formula	AsCl3
Molar mass	181,2797 g/mol
Appearance	yellow-orange crystals
CAS number	[7784-34-1]
Properties
Density and phase	2.15 g/cm3, solid
Solubility in water	decomposes
Melting point	310 °C
Boiling point	707 °C
Vapor Pressure	1 mm Hg (23.5 °C)
'Hazards'
EU classification	not listed
NFPA 704	nfpa_h4.png nfpa_f0.png nfpa_r0.png
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

'Arsenic trichloride' is the chemical compound with the formula AsCl₃. This colourless liquid is a starting reagent for the synthesis of organoarsenic compounds, such as triphenylarsine.
Treatment of arsenic(III) oxide with concentrated hydrochloric acid followed by distillation gives AsCl₃. Thus, in contrast to PCl₃, this compound has some stability in the presence of acidic water.^[1]

Contents

Representative reactions

References

External links

Representative reactions

★ The redistribution of As₂O₃ and AsCl₃ gives the linear polymer AsOCl.

★ With chloride sources, AsCl₃, forms salts containing the anion [AsCl₄]⁻.

References

1. Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.

External links