Hydrogen iodide

HIHydriodic acidhydrogen-iodine reactionhydroiodic acid
Hydrogen iodide is a diatomic molecule and hydrogen halide.wikipedia
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Hydroiodic acid

hydriodic acidHIhydroiodic
Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid.
Hydroiodic acid (or hydriodic acid) is a highly acidic aqueous solution of hydrogen iodide (HI)

Hydrogen halide

hydrohalic acidhydrohalic acidshydrogen halides
Hydrogen iodide is a diatomic molecule and hydrogen halide.

Iodine

II 2 iodinated
HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.
The simplest compound of iodine is hydrogen iodide, HI.

Alkene

olefinalkenesolefins
Like HBr and HCl, HI adds to alkenes:
Hydrohalogenation is the addition of hydrogen halides such as HCl or HI to alkenes to yield the corresponding haloalkanes:

Phosphorus triiodide

PI 3
In the laboratory, another method involves hydrolysis of PI 3, the iodine equivalent of PBr 3.
Alternatively, PCl 3 may be converted to PI 3 by the action of hydrogen iodide or certain metal iodides.

Diatomic molecule

diatomicdiatomic moleculesdi-
Hydrogen iodide is a diatomic molecule and hydrogen halide.

Aqueous solution

aqueouswater solubilityaqueous solutions
Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid.

Organic synthesis

synthesissynthesizedsynthetic
HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.

Inorganic chemistry

inorganicinorganic chemistinorganic compounds
HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.

Reducing agent

reductantreducing agentsreducing
HI is used in organic and inorganic synthesis as one of the primary sources of iodine and as a reducing agent.

Acid strength

weak acidstrong acidstrong acids
Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid.

Hydrazine

hydrazine hydratehydraziniumN 2 H 4
The industrial preparation of HI involves the reaction of I 2 with hydrazine, which also yields nitrogen gas:

Nitrogen

NN 2 dinitrogen
The industrial preparation of HI involves the reaction of I 2 with hydrazine, which also yields nitrogen gas:

Distillation

distillerydistilleddistilling
When performed in water, the HI must be distilled.

Sodium iodide

NaINaI(Tl)crystal detectors
HI can also be distilled from a solution of NaI or other alkali iodide in concentrated phosphoric acid (note that concentrated sulfuric acid will not work for acidifying iodides, as it will oxidize the iodide to elemental iodine).

Phosphoric acid

phosphoricH 3 PO 4 orthophosphoric acid
HI can also be distilled from a solution of NaI or other alkali iodide in concentrated phosphoric acid (note that concentrated sulfuric acid will not work for acidifying iodides, as it will oxidize the iodide to elemental iodine).

Sulfuric acid

sulphuric acidsulfuricH 2 SO 4
HI can also be distilled from a solution of NaI or other alkali iodide in concentrated phosphoric acid (note that concentrated sulfuric acid will not work for acidifying iodides, as it will oxidize the iodide to elemental iodine).

Hydrogen sulfide

hydrogen sulphideH 2 SStink damp
Another way HI may be prepared is by bubbling hydrogen sulfide steam through an aqueous solution of iodine, forming hydroiodic acid (which is distilled) and elemental sulfur (this is filtered):

Bond-dissociation energy

bond dissociation energydissociation energybond dissociation energies
However, when a mixture of the gases is irradiated with the wavelength of light equal to the dissociation energy of I 2, about 578 nm, the rate increases significantly.

Hydrolysis

hydrolyzedhydrolysehydrolyze
In the laboratory, another method involves hydrolysis of PI 3, the iodine equivalent of PBr 3.