Tetrachloroiodic acid
Tetrachloroiodic acid is an inorganic compound, a polyhalide acid with the formula HICl4. In addition to an anhydrous form, an orange crystalline tetrahydrate is known. It is unstable in air.[1]
| Tetrachloroiodic acid | |
|---|---|
| Identifiers | |
| CAS number | |
| SMILES | [H+].[Cl-][I3+]([Cl-])([Cl-])[Cl-] |
| Properties | |
| Molecular formula | HICl4 |
| Appearance | Orange crystals (hydrate) |
| Melting point |
19 °C, 292 K, 66 °F |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Synthesis
Tetrachloroiodic acid may be formed by dissolution of iodine trichloride in concentrated hydrochloric acid:[2]
- ICl
3 + HCl → HICl
4
Tetrachloroiodic acid may also be made by passing chlorine through a solution of iodine in concentrated hydrochloric acid :
- I
2 + 3 Cl
2 + 2 HCl + 4 H
2O → 2 HICl
4
Physical propieties
Tetrachloroiodic acid forms a crystal hydrate which has orange crystals that are unstable in air and melt by dissolving in their own water of crystallization at 19 °C.[2]
Corrodes skin, paper, etc.
See also
References
- ↑ Tetrachloroiodic (3) acid HICl4x4H2O
- ↑ 2.0 2.1 Bateman, Richard J.; Bateman, Linda R. (1972). "Solid-state structure, nuclear quadrupole resonance spectrum, and the resultant symmetry implications for tetrachloroiodic acid tetrahydrate". Journal of the American Chemical Society. 94 (4): 1130–1134. doi:10.1021/ja00759a017.