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Inorganic acids

Hydrogen iodide

Also known as Hydriodic acid, Hydroiodic acid, iodane

CAS 10034-85-2Formula HIMolar mass 127.91 g/molEC 233-109-9
GHS signal word: Danger. Pictograms: Gas under pressure, Corrosive 39 suppliers listed
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Hydrogen iodide chemical structure, HI, CAS 10034-85-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless gas, fumes in moist air
Melting point
-50.8 °C
Boiling point
-35.1 °C
Density
5.66 g/L at 0 °C, 5.23 g/L at 25 °C
Solubility
Extremely soluble in water, 234 g/100 g water at 10 °C, 900 g/100 g water at 0 °C
HS code
281119
Category
Inorganic acids
UN number
UN 1787
Illustrative photo, a bundle of gas cylinders on a manifold in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Hydrogen iodide?

Plain description, key identifiers and synonyms

Iodine atom is chemical element with atomic number 53. It has a role as a micronutrient and a human metabolite.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
iodane
CAS number
10034-85-2 CAS number cross-checkedOther or deprecated CAS: 14362-44-8, 17144-19-3
EC number
233-109-9
Molecular formula
HI
UNII
5D3DB66WM3, 694C0EFT9Q
MDL number
MFCD00011347
InChIKey
XMBWDFGMSWQBCA-UHFFFAOYSA-N
InChI
InChI=1S/HI/h1H
SMILES (canonical and isomeric)
I

Synonyms

  • Hydriodic acid
  • Hydroiodic acid
  • iodane
  • Hyriodic acid
  • Acido yodhidrico
  • Acide iodhydrique
  • Hydrogen iodide (HI)
  • Anhydrous hydriodic acid
  • Hydrogen iodide, anhydrous
  • Iodure d'hydrogene anhydre
  • Yoduro de hidrogeno anhidro
  • Jodwasserstoff
  • hydroiodide
  • HI
  • hydriodide
  • Hydriotic acid
  • Iodine, isotope of mass 125
  • Hydrogeniodid
  • Iodwasserstoff
  • Wasserstoffiodid
  • iodure d'hydrogene
  • organoiodine compound
  • organoiodine compounds
  • Iohydroic acid
  • Hydriodic acid [UN1787] [Corrosive]
Show all 28 synonyms
  • Hydriodic acid, puriss. p.a., >=67% (T)
  • Hydriodic acid, purum p.a., 55-59% (T)
  • Hydriodic acid, JIS special grade, 55.0-58.0%

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless gas, fumes in moist airexp.
Odour
Acridexp.
Melting point
-50.8 °Cexp.
Boiling point
-35.1 °Cexp.
Density
5.66 g/L at 0 °C, 5.23 g/L at 25 °Cexp.
Solubility
Extremely soluble in water, 234 g/100 g water at 10 °C, 900 g/100 g water at 0 °Cexp.
Vapour pressure
5,938 mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
127.91 g/molcalc.
Exact mass
127.9123 Dacalc.
LogP (octanol/water)
0.62calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS04: Gas under pressure
Gas under pressure
GHS05: Corrosive
Corrosive

Hazard statements

  • H314Causes severe skin burns and eye damage.
Precautionary statements (12)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1787
Transport hazard class
8
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Hydrogen iodide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 39 suppliers
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Where suppliers are based

39 suppliers in 12 countries

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Hydrogen iodide price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Reducing agent, manufacture of inorganic iodides, pharmaceuticals, disinfectants. The 57% acid is also used for analytical purposes, such as methoxyl determinations. (Hydriodic acid).

Formerly used for its expectorant action in chronic bronchitis & bronchial asthma to liquefy thick, tenacious sputum. (Hydriodic acid, syrup).

Preparation of iodine salts, organic preparations, analytical reagent, disinfectant, and pharmaceuticals. (Hydriodic acid).

Industrial uses: Laboratory chemicals, Intermediate, Catalyst, Cleaning agent, Other.

Consumer uses: Other, Catalyst.

Roles

  • animal metabolite
  • eukaryotic metabolite
  • food component
  • human metabolite
  • mammalian metabolite
  • metabolite
  • micronutrient
  • mouse metabolite
  • nutrient
  • physiological role

How it is made

Prepared by absorption of hydrogen iodide gas in water or by the action of iodine on hydrogen sulfide. (Hydriodic acid)

Prepared by catalytic reaction of iodine and hydrogen or concentrated hydriodic acid solutions with phosphorous pentoxide. (Hydrogen iodide gas)

Hydroiodic acid is the colorless solution formed when hydrogen iodide gas dissolves in water. It is prepared by reaction of iodine with hydrogen sulfide or hydrazine, or by an electrolytic method. Typically commercial hydroiodic acid contains 40-55% HI.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 053-002-00-9

Controls

  • US DEA controlled substance or listed chemical

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Hydrogen iodide is traded under.

HS 2811.19Indicative HS code

Inorganic acids, other than hydrogen fluoride

World exports in 2024
$494M
+6.5% vs 2023, imports $458M
2019 to 2024
Top exporters
  1. China24.9%
  2. Israel16.0%
  3. Jordan * partner reported11.7%
Top importers
  1. China29.3%
  2. United States16.2%
  3. Germany7.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Hydrogen iodide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Hydrogen iodide, based on the data on this page

What is Hydrogen iodide?

Iodine atom is chemical element with atomic number 53. It has a role as a micronutrient and a human metabolite.

What is the CAS number of Hydrogen iodide?

The CAS registry number of Hydrogen iodide is 10034-85-2. Other or deprecated CAS numbers: 14362-44-8, 17144-19-3.

What is the molecular formula and weight of Hydrogen iodide?

The molecular formula of Hydrogen iodide is HI and its molar mass is 127.91 g/mol.

What is Hydrogen iodide used for?

Reducing agent, manufacture of inorganic iodides, pharmaceuticals, disinfectants. The 57% acid is also used for analytical purposes, such as methoxyl determinations. (Hydriodic acid). Formerly used for its expectorant action in chronic bronchitis & bronchial asthma to liquefy thick, tenacious sputum.

Is Hydrogen iodide hazardous?

Hydrogen iodide carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Hydrogen iodide?

Hydrogen iodide is usually classified under HS code 281119 (II. INORGANIC ACIDS AND INORGANIC OXYGEN COMPOUNDS OF NON-METALS, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Hydrogen iodide?

CompoundList lists 39 suppliers of Hydrogen iodide in China, India, United States, Japan and 8 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Hydrogen iodide in India?

9 suppliers in India list Hydrogen iodide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Hydrogen iodide?

Suppliers quote Hydrogen iodide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Hydrogen iodide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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