Imidazole
CAS 288-32-4C3H4N268.08 g/mol
1H-imidazole is an imidazole tautomer which has the migrating hydrogen at position 1. It is a conjugate base of an imidazolium cation. It is a conjugate acid of an imidazolide. It is a tautomer of a 4H-imidazole.
IUPAC: 1H-imidazole
PubChem
Physical & Chemical Properties
| Melting Point | 90.5 °C |
| Boiling Point | 257 °C |
| Density | Density: 1.0303 g/cu m at 101 °C |
| Solubility | Very soluble in water |
| Flash Point | 145 °C (293 °F) - closed cup |
| Vapor Pressure | 0.002 [mmHg] |
| pH | pH 10.5 for 38 g/L at 20 °C |
| Appearance | Liquid, Other Solid |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
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HS Code(s): 2933
Data: UN Comtrade
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