Arsenic trichloride
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| Arsenic trichloride | |
|---|---|
 |
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| Other names | Arsenic(III) chloride butter of arsenic |
| Identifiers | |
| CAS number | [7784-34-1] |
| Properties | |
| Molecular formula | AsCl3 |
| Molar mass | 181.279 g/mol |
| Appearance | colourless liquid |
| Density | 2.15 g/cm3, liquid |
| Melting point |
−16 °C |
| Boiling point |
130 °C |
| Solubility in water | decomposes |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |
 0
4
0
|
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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.
It is prepared by treatment of arsenic(III) oxide with concentrated hydrochloric acid followed by distillation:
- As2O3 + 6 HCl → 2 AsCl3 + 3 H2O
Thus, in contrast to PCl3, this compound has increased stability in the presence of acidic water.[1] It undergoes a redistribution with As2O3 and AsCl3 gives the linear polymer AsOCl. With chloride sources, AsCl3, forms salts containing the anion [AsCl4]−.
[edit] References
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
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