Hydrogen chloride CAS 7647-01-0, with the chemical formula HCl, is a colorless and pungent gas composed of one chlorine atom and one hydrogen atom. Its aqueous solution is called hydrochloric acid, also known as hydrochloric acid. Hydrogen chloride is highly soluble in water, and at 0 ℃, 1 volume of water can dissolve approximately 500 volumes of hydrogen chloride.

Hydrogen chloride is mainly used in the production of dyes, spices, pharmaceuticals, various chlorides, and corrosion inhibitors.

Chinese name: Hydrogen chloride

Foreign name: hydrogen chloride, hydrochloride

Chemical formula: HCl

Molecular weight: 36.46

CAS login number: 7647-01-0

EINECS login number: 231-595-7

Melting point: -114.2 ℃

Boiling point: -85.1 ℃

Water solubility: easily soluble

Density: 1.477 kg/m ³

Appearance: colorless gas

Physical property

Hydrogen chloride, colorless, with a melting point of -114.2 ℃ and a boiling point of -85 ℃. It does not burn in air and is thermally stable. It does not decompose until about 1500 ℃. It has a suffocating odor, strong irritation to the upper respiratory tract, and corrosion to the eyes, skin, and mucous membranes. The density is greater than that of air, and its aqueous solution is hydrochloric acid, while concentrated hydrochloric acid is volatile.

Appearance: Colorless hygroscopic gas

Density: 1.477g/L (gas)

Melting point: -114.2 ℃

Boiling point: -85.1 ℃

Solubility (water): 72g/100mL (20 ℃) (standard pressure)

Saturated vapor pressure (kPa): 4225.6 (20 ℃)

Chemical property

Hydrogen chloride, a corrosive non combustible gas, does not react with water but is easily soluble in water. It often exists in the form of hydrochloric acid acid mist in the air. Easily soluble in ethanol and ether, as well as various other organic compounds; Easily soluble in water, at 25 ℃ and 1 atmospheric pressure, 1 volume of water can dissolve 503 volumes of hydrogen chloride gas. The chemical properties of dry hydrogen chloride are very inactive. Alkali metals and alkaline earth metals can burn in hydrogen chloride, while sodium burns with a bright yellow flame.

The aqueous solution of hydrogen chloride is hydrochloric acid. Industrial hydrochloric acid often appears slightly yellow, mainly due to the presence of ferric chloride. Ammonia is commonly used to test the presence of hydrochloric acid. Ammonia reacts with hydrogen chloride to form white ammonium chloride particles. Hydrogen chloride has a strong dipole that forms hydrogen bonds with other dipoles.

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