Hydrogen Chloride (HCl)

IUPAC Name Hydrogen chloride
Common nameHydrogen chloride
SynonymsHydrogen Chloride (HCl), Hydrochloric acid gas, Hydrochloric gas, Hydrochloride
Molecular formulaHCl
Molar mass36.46 g/mol
Molecular weight36.46
Physical state (at room temperature)Gas
FlammabilityNonflammable gas
ColourColourless to yellowish
OdorStrong irritating odor
Solubility in waterHighly soluble
CAS Number7647-01-0
EC Number231-595-7
PubChem Substance ID329753973
PubChem CID313

Hydrogen ChlorideHydrogen 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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