Hydrogen iodide
A diatomic molecule containing covalently bonded hydrogen and iodine atoms. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
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Identity & molecular properties
Source-linked values| CAS number | 10034-85-2 | ChEBI ↗ |
| Molecular formula | HI | ChEBI ↗ |
| Molar mass | 127.912 g/mol | ChEBI ↗ |
| Monoisotopic mass | 127.9123 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:43451 | ChEBI ↗ |
Names & structural identifiers
Copy any identifierhydrogen iodidehydrogen iodideXMBWDFGMSWQBCA-UHFFFAOYSA-N[H]IInChI=1S/HI/h1HNames & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentHydrogen iodide · H27-B-021/C-042B_P
| Endpoint | Reported classification |
|---|---|
| Gases under pressure | Liquefied gas |
| Skin corrosion/irritation | Category 1 |
| Serious eye damage/eye irritation | Category 1 |
| Specific target organ toxicity - Single exposure | Category 1 (respiratory system) |
| Specific target organ toxicity - Repeated exposure | Category 1 (skin, thyroid, respiratory system, systemic toxicity) |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 127.912 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsIHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
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Sources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.