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Chemical substance
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
Chemical compounds containing iodine
smallest of the hydrogen halides, at 295 kJ/mol. Aqueous hydrogen iodide is known as hydroiodic acid, which is a strong acid. Hydrogen iodide is exceptionally
Iodine_compounds
Ion, and compounds containing the ion
An iodide ion is I−. Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a
Iodide
Chemical element with atomic number 53 (I)
smallest of the hydrogen halides, at 295 kJ/mol. Aqueous hydrogen iodide is known as hydroiodic acid, which is a strong acid. Hydrogen iodide is exceptionally
Iodine
Aqueous solution of hydrogen iodide
aqueous solution of hydrogen iodide. It is a strong acid, in which hydrogen iodide is ionized completely into hydronium and iodide. Concentrated aqueous
Hydroiodic_acid
Chemical compound
salt of magnesium and hydrogen iodide. These salts are typical ionic halides, being highly soluble in water. Magnesium iodide has few commercial uses
Magnesium_iodide
splitting water into hydrogen. PEC cells have been under development since 1972. Alternative Fuels: Research explores the use of hydrogen iodide (HI) as an alternative
Solar–hydrogen_energy_cycle
Chemical reaction
sulfuric acid and hydrogen iodide: 2H2O + SO2 + I2 → H2SO4 + 2HI This reaction is the first step in the sulfur-iodine cycle to produce hydrogen. The products
Bunsen_reaction
Antiseptic solution
taking lithium. Povidone-iodine is a chemical complex of povidone, hydrogen iodide, and elemental iodine. The recommended strength solution contains 10%
Povidone-iodine
Ion
(AsH+ 4Br− ) and arsonium iodide (AsH+ 4I− ), which can be synthesized by reacting arsine with hydrogen bromide or hydrogen iodide. Or more commonly, as organic
Arsonium
Chemical compound
Iodomethane can also be prepared by the reaction of methanol with aqueous hydrogen iodide: CH3OH + HI → CH3I + H2O The generated iodomethane can be distilled
Iodomethane
Chemical compound
Radium iodide is an inorganic compound of radium and iodine with the chemical formula RaI2. It is the radium salt of hydrogen iodide, consisting of radium
Radium_iodide
Chemical data page
This page provides supplementary chemical data on hydrogen iodide. The handling of this chemical may incur notable safety precautions. It is highly recommend
Hydrogen_iodide_(data_page)
Chemical compound
to the formation of iodine. Isopropyl iodide is prepared by iodination of isopropyl alcohol using hydrogen iodide or, equivalently, with a mixture of glycerol
Isopropyl_iodide
Chemical compound
to form hydrogen cyanide. The atoms in this compound's molecules are arranged linearly, having the structural formula I−C≡N. Cyanogen iodide is prepared
Cyanogen_iodide
Chemical compound
Methylammonium iodide in an organic halide with a formula of CH3NH3I. It is an ammonium salt composed of methylamine and hydrogen iodide. The primary application
Methylammonium_iodide
Chemical compound
Because iodide is a good leaving group, ethyl iodide is an excellent ethylating agent. It is also used as the hydrogen radical promoter. Ethyl iodide is prepared
Ethyl_iodide
Topics referred to by the same term
abbreviation HI) Hawaii, US Hotel Indonesia, a hotel in Jakarta, Indonesia Hydrogen iodide, in chemistry, a diatomic molecule Health informatics, a discipline
HI
phosphorous acid, regenerating hydrogen iodide). Because hydrogen iodide exists in a chemical equilibrium with iodine and hydrogen, the phosphorus reaction
History and culture of substituted amphetamines
History_and_culture_of_substituted_amphetamines
Chemical compound
Deuterium iodide is an inorganic compound with the formula DI. Hydrogen iodide "Hydriodic acid-d". CAS Common Chemistry. Retrieved 2026-04-26. v t e
Deuterium_iodide
Topics referred to by the same term
(infectious hepatitis) Idiopathic hypersomnia Intracranial hypertension Hydrogen iodide Induction heating Induction heater Industrial hygiene, the control
IH
Chemical reaction in organic chemistry
beta-proton is allowed to react with hydrogen iodide to the quaternary ammonium salt which when heated degrades to methyl iodide and the secondary amine. Cope
Hofmann_elimination
Chemical compound
atmospheric pressure, phosphonium iodide sublimates and dissociates reversibly into phosphine and hydrogen iodide (HI). It oxidizes slowly in air to
Phosphonium_iodide
Chemical compound consisting of hydrogen bonded to a halogen element
In chemistry, hydrogen halides (hydrohalic acids when in the aqueous phase) are diatomic, inorganic compounds that function as Arrhenius acids. The formula
Hydrogen_halide
acetic acid and hydrogen iodide in a test tube. The ensuing reaction results in the cleavage of the ether or the ester into an alkyl iodide and respectively
Zeisel_determination
Hot foamy substance
foamy substance caused by the quick decomposition of hydrogen peroxide (H2O2) using potassium iodide (KI) or yeast and warm water as a catalyst. How rapidly
Elephant's_toothpaste
Chemical compound
hydroxide and hydrogen iodide: GaI₃ + 3H₂O → Ga(OH)₃ + 3HI Gallium halides Haynes, p. 4.63 Haynes, p. 5.20 Donges, E. (1963). "Gallium(III) Iodide". In Brauer
Gallium(III)_iodide
Chemical compound
The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. At room temperature, it is a colorless gas, which forms white
Hydrogen_chloride
Group of chemical elements
hydrogen known as the hydrogen halides: hydrogen fluoride (HF), hydrogen chloride (HCl), hydrogen bromide (HBr), hydrogen iodide (HI), and hydrogen astatide
Halogen
German chemist (1871–1942)
Zersetzung des Jodwasserstoffes in der Hitze" (On the degradation of hydrogen iodide in hot temperature), with Victor Meyer as his supervisor at the University
Max_Bodenstein
Chemical compound
Hydrogen fluoride is an inorganic compound with chemical formula HF. It is a colorless gas or liquid that dissolves in water to yield hydrofluoric acid
Hydrogen_fluoride
Enzyme expressed mainly in the thyroid gland
peroxidase or iodide peroxidase, is an enzyme expressed mainly in the thyroid where it is secreted into colloid. Thyroid peroxidase oxidizes iodide ions to
Thyroid_peroxidase
Form of phosphorus
notable in the illicit production of methamphetamine and Krokodil, where hydrogen iodide acts as a reducing agent. Red phosphorus is often used to prepare chemicals
Red_phosphorus
Chemical compound
Hydrogen bromide is the inorganic compound with the formula HBr. It is a hydrogen halide consisting of hydrogen and bromine. A colorless gas, it dissolves
Hydrogen_bromide
Chemical compound
containing at least one methyl group in alpha-position. Some reagents (e.g. hydrogen iodide) convert iodoform to diiodomethane. Conversion to carbon dioxide is
Iodoform
Chemical compound (HIO3)
oxidizer, then the product of the reaction is either elemental iodine or the iodide ion. Under some special conditions (very low pH and high concentration of
Iodic_acid
Chemical compound
ferromagnetic. It can be obtained by the reaction of Tc2(CH3COO)4Cl2 and hydrogen iodide at 150 °C, or by the reaction of technetium and iodine at 300~400 °C
Technetium(III)_iodide
Chemical compound
reactions. Ammonium hypoiodites can be formed by oxidation of the analogous iodide salts. These and also sodium hypoiodite are useful as oxidizing agents for
Hypoiodous_acid
Chemical compound
Hydrogen peroxide is a chemical compound with the formula H2O2. In its pure form, it is a very pale blue liquid; however, at lower concentrations, it appears
Hydrogen_peroxide
Process of removing one or more methyl groups from a molecule
iodide. A slightly milder set of conditions uses cyclohexyl iodide (CyI, 10.0 equiv) in N,N-dimethylformamide to generate a small amount of hydrogen iodide
Demethylation
Class of chemical compounds
Iodide hydrides are mixed anion compounds containing hydride and iodide anions. Many iodide hydrides are cluster compounds, containing a hydrogen atom
Iodide_hydride
Change of enthalpy during the formation of a compound from its elements
for most organic compounds are hypothetical. For instance, carbon and hydrogen will not directly react to form methane (CH4), so that the standard enthalpy
Standard enthalpy of formation
Standard_enthalpy_of_formation
Chemical compound
Ammonium iodide can be made in lab by treating ammonia with iodine and the reductant hydrogen peroxide: 2 NH3 + I2 + H2O2 → 2 NH4I + O2 Ammonium iodide is used
Ammonium_iodide
Chemical compound
Iodine oxidation state −1 +1 +3 +5 +7 Name Hydrogen iodide Hypoiodous acid Iodous acid Iodic acid Periodic acid Formula HI HIO HIO2 HIO3 HIO4 or H5IO6
Iodous_acid
Table of constants for a list of gases and volatile liquids
29 0.0881 Hydrogen fluoride 9.565 0.0739 Hydrogen iodide 6.309 0.0530 Hydrogen selenide 5.338 0.04637 Hydrogen sulfide 4.490 0.04287 Isobutane 13.32 0
Van der Waals constants (data page)
Van_der_Waals_constants_(data_page)
Chemical compound
hydroiodic acid, platinum(IV) iodide forms hydrogen hexaiodoplatinate(IV): PtI4 + 2HI → H2[PtI6] "Platinum(IV) iodide, 99.95% (Metals basis), Pt 27.3%
Platinum(IV)_iodide
Chemical compound
Rubidium iodide can be synthesized in several ways. One is to use a mixed reaction of rubidium hydroxide and hydriodic acid/hydrogen iodide: RbOH + HI
Rubidium_iodide
Chemical compound
of samarium(III) iodide (SmI3). Samarium(II) iodide is a powerful reducing agent – for example it rapidly reduces water to hydrogen. It is available commercially
Samarium(II)_iodide
Chemical compound
Hydrogen cyanide (also called prussic acid) is a chemical compound with the formula HCN and structural formula H−C≡N. It is a highly toxic and flammable
Hydrogen_cyanide
Change in energy from formation of 1 mole of substance
−120.42 Hydrogen cyanide Gas HCN +124.7 Hydrogen iodide Gas HI +1.3 Hydrogen fluoride Gas HF −275.4 Hydrogen chloride Gas HCl −95.30 Iodine Iodine Solid
Standard Gibbs free energy of formation
Standard_Gibbs_free_energy_of_formation
Chemical compound
Alternatively, PCl3 may be converted to PI3 by the action of hydrogen iodide or certain metal iodides. Phosphorus triiodide is commonly used in the laboratory
Phosphorus_triiodide
Chemical compound
almost amorphous powder by addition of iodide salts to aqueous H2PdCl4 solution . When heated in dilute hydrogen iodide solution, this polymorph transforms
Palladium(II)_iodide
Chemical compound
Hydrogen astatide, also known as astatine hydride, astatane, astatidohydrogen or hydroastatic acid, is a chemical compound with the chemical formula HAt
Hydrogen_astatide
Chemical compound
→ TeI2 + I2 It can be also obtained by reacting telluric acid with hydrogen iodide. Te(OH)6 + HI → TeI4 + I2 + 6 H2O It can also be obtained by reacting
Tellurium_tetraiodide
Chemical element with atomic number 17 (Cl)
to shock that explodes on contact with most organic compounds, sets hydrogen iodide and thionyl chloride on fire and even oxidises silver and gold. Although
Chlorine
Method for the manufacture of acetic acid
hydrolysis of the acetyl iodide to acetic acid and hydrogen iodide. The reaction has been shown to be first-order with respect to methyl iodide and [Rh(CO)2I2]−
Monsanto_process
Oxoacid of iodine (H5IO6 or HIO4)
consisting of a slightly deformed IO6 octahedron interlinked via bridging hydrogens. Five I–O bond distances are in the range 1.87–1.91 Å and one I–O bond
Periodic_acid
Chemical compound
by the reaction of germanium monosulfide or germanium monoxide and hydrogen iodide. GeO + 2 HI → GeI2 + H2O GeS + 2 HI → GeI2 + H2S} It can also be produced
Germanium(II)_iodide
Polyatomic anion (IO3) with charge -1
periodate and iodide, in contrast to the situation for chlorate. Iodate is reduced by sulfite: 6HSO−3 + 2IO−3 → 2I− + 6HSO−4 Iodate oxidizes iodide in acidic
Iodate
Chemical compound with formula Na2SO4
others are interstitial, being hydrogen-bonded to sulfate. These cations are linked to the sulfate anions by hydrogen bonds. The Na–O distances are about
Sodium_sulfate
Chemical compound
Dysprosium(II) iodide is an iodide of dysprosium with the chemical formula DyI2. Dysprosium(II) iodide can be produced by reducing dysprosium(III) iodide with metallic
Dysprosium(II)_iodide
Chemical compound
gadolinium(III) iodide at a high temperature: Gd + 2 GdI3 → 3 GdI2 It can react with hydrogen at high temperature (800 °C) to obtain gadolinium hydrogen iodide (GdI2H0
Gadolinium_diiodide
Group of chemical compounds
appropriate halide acid. For instance methylammonium iodide is prepared by combining methylamine and hydrogen iodide at 0 °C for 120 minutes followed by evaporation
Methylammonium_halide
Table salt preparation with iodide salts added
thyroid gland. Animals also benefit from iodine supplements, and the hydrogen iodide derivative of ethylenediamine is the main supplement to livestock feed
Iodised_salt
Chemical compound
Lead(II) iodide (or lead iodide) is a chemical compound with the formula PbI 2. At room temperature, it is a bright yellow odorless crystalline solid,
Lead(II)_iodide
Chemical compound
It can also be made from molybdenum(V) chloride and a solution of hydrogen iodide in carbon disulfide. MoCl5 + 5 HI → MoI3 + 5 HCl + I2 A further method
Molybdenum(III)_iodide
Chemical species that accepts an electron pair from a nucleophile
mechanism. Hydrogen fluoride (HF) and hydrogen iodide (HI) react with alkenes in a similar manner, and Markovnikov-type products will be given. Hydrogen bromide
Electrophile
Chemical compound
by the reaction of disulfur dichloride and potassium iodide, sodium iodide, or hydrogen iodide in pentane at −90 °C, and verified by infrared spectroscopy
Disulfur_diiodide
Class of chemical compounds
iodine to oxidise the sulfite to sulfate, producing hydrogen iodide which can then be used to make hydrogen gas and iodine. When combined with the previous
Sulfite_sulfate
Chemical compound
It can be prepared at 500 °C from californium(III) hydroxide and hydrogen iodide: Cf(OH)3 + 3HI → CfI3 + 3H2O The compound forms a red-orange solid
Californium(III)_iodide
Chemical compound
[Co(H2O)6]2+ and iodide ions as verified crystallographically. Cobalt(II) iodide is prepared by treating cobalt powder with gaseous hydrogen iodide The hydrated
Cobalt(II)_iodide
Chemical compound
Beryllium iodide is an inorganic compound with the chemical formula BeI2. It is a hygroscopic white solid. The Be2+ cation, which is relevant to salt-like
Beryllium_iodide
Chemical compound
also be made from the reaction of Thorium(IV) hydride with hydrogen iodide. Thorium(IV) iodide is an extremely air and moisture sensitive solid which exists
Thorium(IV)_iodide
Chemical compound
and later by reducing it with a combination of sodium amalgam and hydrogen iodide. In 1879, the French chemist Édouard Grimaux synthesized barbituric
Barbituric_acid
Chemical compound
plutonium and mercury(II) iodide: 2 Pu + 3 HgI2 → 2 PuI3 + 3 Hg It can also be produced by reacting plutonium and hydrogen iodide at 450 °C. Even if there
Plutonium(III)_iodide
Chemical compound
CH(CF3)2SSC(CF3)2Br. Dry hydrogen iodide does something different and reduces the sulfur making CH(CF3)2SH. Wet hydrogen iodide only reduces to a disulfide
Hexafluorothioacetone
Class of positively-charged molecules
bromide) iodonium, H2I+ (protonated hydrogen iodide) aminodiazonium, [H2N=N=N]+ ⇌ [H2N−N≡N]+ (protonated hydrogen azide) methylidyneammonium and hydrocyanonium
Onium_ion
Chemical compound
atoms of hydrogen (defect perovskite structure). Each hydrogen atom occupies a large tetrahedral hole in the lattice. The density of hydrogen in uranium
Uranium(III)_hydride
Chemical compound
or (CH2)5CHI. Iodocyclohexane has been prepared by the addition of hydrogen iodide to cyclohexene. Alternatively, it can be prepared by the reaction of
Iodocyclohexane
Chemical compound
substituents. It is formed by the reaction of dibromoacetylene with hydrogen iodide. There are three isomers of dibromoiodoethylene, varying in the position
Dibromoiodoethylene
Experiment to show chemical kinetics in action
method commences with a solution of hydrogen peroxide and sulfuric acid. To this, a solution containing potassium iodide, sodium thiosulfate, and starch is
Iodine_clock_reaction
Chemical compound
thiophosphoryl difluoride iodide, PSIF2. PSIF2 can be converted to hydrothiophosphoryldifluoride, S=PHF2, by reducing it with hydrogen iodide. In F2P(=S)−S−PF2
Thiophosphoryl_fluoride
Chemical compound
reaction of plutonium dioxide with hydrogen iodide: PuO2 + ½H2 + HI → PuOI + H2O It can also be made by passing hydrogen iodide through heated plutonium(IV)
Plutonium_oxyiodide
Chemical compound
Mitsuo Sawamoto; Chihiro Okamoto; Toshinobu Higashimura (1987). "Hydrogen iodide/zinc iodide: a new initiating system for living cationic polymerization of
Diethylzinc
Chemical compound
(1 June 1989). "Catalytic bromide and iodide exchange of alkyl chlorides with hydrogen bromide and hydrogen iodide". The Journal of Organic Chemistry. 54
Tribromochloromethane
711 (1–3): 173–183. doi:10.1016/j.theochem.2004.10.003. "Pentafluoroethyl iodide | C2F5I". www.chemspider.com. W. J. Middleton; D. M. Gale (1988).
List_of_gases
Chemical production of a pharmaceutical drug
intermediate 4 and then stable cyclic carbamate 5 after elimination of hydrogen iodide with DBU. The amide group is reprotected as BOC 6 and the azide group
Oseltamivir_total_synthesis
Chemical compound
parent quinazoline from o-nitrobenzylamine, which was reduced with hydrogen iodide and red phosphorus to 2-aminobenzylamine. The reduced intermediate
Quinazoline
Chemical compound
rhenium and iodide with the chemical formula ReI 4. Rhenium tetraiodide can be obtained via the reduction of perrhenic acid with hydrogen iodide: 2HReO4 +
Rhenium_tetraiodide
Chemical reactions
samarium(II) iodide. In the presence of samarium(II) iodide, the halogen atom of alkyl, alkenyl, and aryl halides is replaced by hydrogen. In tetrahydrofuran
Reductions with samarium(II) iodide
Reductions_with_samarium(II)_iodide
Method of chemical analysis
and petroleum. The reaction involves converting solid iodine into hydrogen iodide in the presence of sulfur dioxide and water. Methanol is most often
Coulometry
Chemical compound
iodide is an iodide of iridium, with the chemical formula of IrI3. Iridium(III) iodide can be obtained by reducing iridium(IV) iodide with hydrogen at
Iridium(III)_iodide
Coordination complexes of transition metals and metal ions with carbon monoxide ligands
acetic acid is produced from methanol, carbon monoxide, and water using hydrogen iodide as well as rhodium and iridium carbonyl catalysts, respectively. Related
Metal_carbonyl
Chemical compound
Berkelium(III) iodide is a binary inorganic compound of berkelium and iodine with the chemical formula BkI3. Synthesis of berkelium(III) iodide is by action
Berkelium(III)_iodide
Chemical synthesis
(losing one asymmetric center in the process). Subsequent treatment with hydrogen iodide and red phosphorus removed the tosyl group and hydrolysed both remaining
Strychnine_total_synthesis
Chemical compound
and an alkali metal iodide (NaH·MI, M = Li, Na). Although not commercially significant, sodium hydride has been proposed for hydrogen storage for use in
Sodium_hydride
Chemical compound
Samarium(III) iodide is an inorganic compound, a salt of samarium and hydroiodic acid with the chemical formula SmI 3. Samarium(III) iodide is prepared
Samarium(III)_iodide
Chemical compound
as boron triiodide, this reaction also produces lithium iodide, hydrogen and hydrogen iodide: 3LiBH4 + 8I2 → 3LiI + 3BI3 + 4H2 + 4HI In its pure state
Boron_triiodide
Chemical compound
react with water, forming hazardous by-products such as hydrogen fluoride (HF), hydrogen iodide (HI) and carbonyl fluoride (COF2).[citation needed] Trifluoroiodomethane
Trifluoroiodomethane
Oscillating chemical reaction
compound with an active ("enolic") hydrogen atom attached to carbon which will slowly reduce free iodine (I2) to iodide (I−). (Malonic acid (CH2(COOH)2)
Briggs–Rauscher_reaction
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