Chemicals List 1 >> Hydroiodic
CAS number 10034-85-2
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
Other anions Hydrogen fluoride
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
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)
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
1) Fire and explosion: Non-explosive; Water sprinkling is advised to
2) Gas generation: HI fumes
3) Others Strong mono-basic acid
1) Rinse eyes with water immediately.
2) Wash contaminated skin areas with soap and dilute aqueous sodium
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
Handling & Storage
1) Tightly seal the container and store in a cool, dark, well
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
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. 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