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Hydrogen iodide (HI) is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid . Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas under standard conditions, whereas the other is an aqueous solution of the gas .
This page provides supplementary chemical data on hydrogen iodide. Structure and properties ... Critical point: 424 K (151 °C), 8310000 Pa Std enthalpy change
The melting and boiling points of iodine are the highest among the halogens, ... Hydrogen iodide, at 300–320 °C (572–608 °F), gives hydrogen and the initial ...
Hence hydroiodic acid cannot be concentrated past this point by evaporation of water. [5] Unlike hydrogen fluoride, anhydrous liquid hydrogen iodide is difficult to work with as a solvent, because its boiling point is low, it has a small liquid range, its dielectric constant is low and it does not dissociate appreciably into H 2 I + and HI −
The hydrogen halides are colourless gases at standard conditions for temperature and pressure (STP) except for hydrogen fluoride, which boils at 19 °C. Alone of the hydrogen halides, hydrogen fluoride exhibits hydrogen bonding between molecules, and therefore has the highest melting and boiling points of the HX series. From HCl to HI the ...
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Melting point: not isolable: not isolable: not isolable: decomp. 100 °C: decomp. 75 °C: decomp. 300–350 °C: ... • The -1 oxidation state, hydrogen iodide, is ...
"Thermodynamic Properties of Argon from the Triple Point to 1200 K with Pressures to 1000 MPa". Journal of Physical and Chemical Reference Data. 18 (2). AIP Publishing: 639– 798. Bibcode:1989JPCRD..18..639S. doi:10.1063/1.555829. ISSN 0047-2689. m - S̆ifner, O.; Klomfar, J. (1994). "Thermodynamic Properties of Xenon from the Triple Point to ...