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Hydroiodic Acid
CAS number 10034-85-2

Hydroiodic Acid formula HI


CAS number [10034-85-2]
RTECS number MW3760000


Molecular formula HI
Molar mass 127.904 g/mol
Appearance Colorless gas.
Density 2.85 g/mL (-47 C)
Melting point 50.80 C (184.55 K)
Boiling point 34.36 C (237.79 K)
Acidity (pKa) 10


Molecular shape Terminus
Dipole moment 0.38 D

Related compounds

Other anions Hydrogen fluoride
Hydrogen chloride
Hydrogen bromide

Once again, although chemically related, hydroiodic acid is not HI but made from it. Commercial "concentrated" hydroiodic acid usually contains 48% - 57% HI by weight. The solution forms an azeotrope boiling at 127 C at 57% HI, 43% water. Hydroiodidic acid is one of the strongest of all the common halide acids, despite the fact that the electronegativity of iodine is weaker than the rest of the other common halides. The high acidity is caused by the dispersal of the ionic charge over the anion. The iodide ion is much larger than the other common halides which results in the negative charge being dispersed over a large space. By contrast, a chloride ion is much smaller, meaning its negative charge is more concentrated, leading to a stronger interaction between the proton and the chloride ion. This weaker H+---I− interaction in HI facilitates dissociation of the proton from the anion .

HI(g) + H2O(l) ⇌ H3O+(aq) + I(aq) (Ka ≈ 1010)
HBr(g) + H2O(l) ⇌ H3O+(aq) + Br(aq) (Ka ≈ 109)
HCl(g) + H2O(l) ⇌ H3O+(aq) + Cl(aq) (Ka ≈ 108)

Appearance Yellow color liquid (57% aqueous solution)

Reactivity It reacts with many metals to generate hydrogen and to form the metal iodides. It acts as a reducing agent on organic compounds.


Item ISE Standard JIS K8917-1975 Special Class
Nonvolatile constituents 0.01% max. 0.01% max.
Combustion residue (Sulfate) 0.005% max. 0.005% max.
Hydrochloric acid/ Hydrobromic Acid (as CI) 0.01% max. 0.01% max.
Sulfates (SO4) 0.003% max. 0.003% max.
Phosphates (PO4) 0.001% max. 0.001% max.
Heavy metals (as Pb) 0.001% max. 0.001% max.
Iron (Fe) 0.0005% max. 0.0005% max.
Arsenic (As) 0.0001% max. 0.0001% max.
Free iodine (I) 0.06% max. 0.76% max.
To pass test
Appearance (Slightly red)
Assay A: 56% min. 55 ~ 58%
B: 57% min.


Outside packing Special plastic container (20l)
Net weight 30 kg (Sealed with nitrogen gas)


Reducing agent
Iodide synthesis material
Preparation of inorganic iodides (KI, NaI, NH4I, AgI, etc.)
Preparation of inorganic iodides (iodobenzoic acids or similar compounds for X-ray contrast intermediates, aliphatic iodides, etc.)
Disinfectant and Sanitizer formulations

Health Hazards
1) Fire and explosion: Non-explosive; Water sprinkling is advised to extinguish fire.
2) Gas generation: HI fumes
3) Others Strong mono-basic acid

First aid

1) Rinse eyes with water immediately.
2) Wash contaminated skin areas with soap and dilute aqueous sodium carbonate solution.
3) When taken orally, wash the stomach a 5% aqueous solution of calcium chloride, and administer a self-containing purgative.
4) Oxygen inhalation, and calcium-rich food have been found effective.

Handling & Storage

1) Tightly seal the container and store in a cool, dark, well ventilated place
2) Use rubber gloves, fully body protection garments and gas mask.
3) Mixing and contact hazardous materials: Alkali metals


Diluted with water, then cover spilled hydroiodic acid with sodium bicarbonate or a mixture of soda ash and slaked lime (50 : 50). Mix together, and add water if necessary to produce a slurry. Collect the slurry into a container, and wash contaminated surfaces with a large amount of water.


Note /Government Notification: These chemicals are designated as those that are used in the manufacture of the controlled substances and are important to the manufacture of the substances. For any (Control Substance) products Import and Export *** subjected to your country government laws /control substance ACT.
Information:  The information on this web page is provided to help you to work safely, but it is intended to be an overview of hazards, not a replacement for a full Material Safety Data Sheet (MSDS). MSDS forms can be downloaded from the web sites of many chemical suppliers. ,also that the information on the PTCL Safety web site, where this page was hosted, has been copied onto many other sites, often without permission. If you have any doubts about the veracity of the information that you are viewing, or have any queries, please check the URL that your web browser displays for this page. If the URL begins "www.tajapi.com/www/Denatonium Benzoate.htm/" the page is maintained by the Safety Officer in Physical Chemistry at Oxford University. If not, this page is a copy made by some other person and we have no responsibility for it.
The Controlled Substances Act (CSA) was enacted into law by the Congress of the United States as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970.[1] The CSA is the federal U.S. drug policy under which the manufacture, importation, possession, use and distribution of certain substances is regulated. The Act also served as the national implementing legislation for the Single Convention on Narcotic Drugs

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