| IUPAC Name | Hydrogen chloride |
| Common name | Hydrogen chloride |
| Synonyms | Hydrogen Chloride (HCl), Hydrochloric acid gas, Hydrochloric gas, Hydrochloride |
| Molecular formula | HCl |
| Molar mass | 36.46 g/mol |
| Molecular weight | 36.46 |
| Physical state (at room temperature) | Gas |
| Flammability | Nonflammable gas |
| Colour | Colourless to yellowish |
| Odor | Strong irritating odor |
| Solubility in water | Highly soluble |
| CAS Number | 7647-01-0 |
| EC Number | 231-595-7 |
| PubChem Substance ID | 329753973 |
| NACRES | NA.21 |
| PubChem CID | 313 |
Hydrogen Chloride (HCl) is an inorganic compound of two elements: hydrogen (atomic number 1) and chlorine (atomic number 17). Hydrogen chloride is a colourless to yellowish, corrosive, nonflammable gas at room temperature. The hydrogen chloride gas is heavier than air and has a strong irritating odor. It is readily soluble in water and forms an acidic solution. It’s solution in water is called hydrochloric acid. Hydrochloric acid is a very strong acid. It hydrolyzes in water into H+ (H3O+) and Cl﹣.
HCl + H2O ⇋ H3O+ + Cl﹣
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