|Preferred IUPAC name
|Systematic IUPAC name
|Molar mass||455.635 g/mol|
|Appearance||orange-red crystalline solid|
|Melting point||146 °C (295 °F; 419 K)|
|6 g/100 mL|
|Solubility||soluble in alcohol, ether, CS2|
Refractive index (nD)
|Crystal structure||Rhombohedral, hR24, SpaceGroup = R-3, No. 148|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
- AsCl3 + 3KI → AsI3 + 3 KCl
Hydrolysis occurs only slowly in water forming arsenic trioxide and hydroiodic acid. The reaction proceeds via formation of arsenous acid which exists in equilibrium with hydroiodic acid. The aqueous solution is highly acidic, pH of 0.1N solution is 1.1. It decomposes to arsenic trioxide, elemental arsenic and iodine when heated in air at 200 °C. The decomposition, however, commences at 100 °C and occurs with the liberation of iodine.
- John C. Bailar, Jr. "Arsenic Triiodide" Inorganic Syntheses 1939, volume 1, pp. 103–104, 2007. doi:10.1002/9780470132326.ch36
- Shakhashiri BZ, "Chemical of the Week: Arsenic", University of Wisconsin–Madison Chemistry Dept.
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