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Tetrachloroiodic acid

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Tetrachloroiodic acid
Identifiers
3D model (JSmol)
  • InChI=1S/Cl4I/c1-5(2,3)4/q-1/p+1
    Key: VEFRWHPHQIYAIZ-UHFFFAOYSA-O
  • [H+].[Cl-][I3+]([Cl-])([Cl-])[Cl-]
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).

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]

Synthesis

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Tetrachloroiodic 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

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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]

See also

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References

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  1. ^ Tetrachloroiodic (3) acid HICl4x4H2O
  2. ^ 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.