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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]
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3D model (JSmol)
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| Properties | |
| HICl4 | |
| Appearance | Orange crystals (hydrate) |
| Melting point | 19 °C (66 °F; 292 K) (hydrate) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
editTetrachloroiodic acid may be formed by dissolution of iodine trichloride in concentrated hydrochloric acid:[2]
- ICl3 + HCl → HICl4
Tetrachloroiodic acid may also be made by passing chlorine through a solution of iodine in concentrated hydrochloric acid :
- I2 + 3 Cl2 + 2 HCl + 4 H2O → 2 HICl4
Physical propieties
editTetrachloroiodic 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]
See also
editReferences
edit- ^ Tetrachloroiodic (3) acid HICl4x4H2O
- ^ a b 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.
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