Hydrogen chloride, whose chemical formula is HCl, is a colorless gas with a pungent odor. Its aqueous solution is commonly known as hydrochloric acid and the scientific name is hydrochloric acid. Hydrogen chloride is very soluble in water. At 0°C, 1 volume of water can dissolve approximately 500 volumes of hydrogen chloride.
Hydrogen chloride is colorless, with a melting point of -114.2°C and a boiling point of -85°C. It does not burn in the air and is thermally stable. It does not decompose until about 1500°C. It has a suffocating odor, has a strong irritation to the upper respiratory tract, and is corrosive to eyes, skin and mucous membranes. The density is greater than air, its aqueous solution is hydrochloric acid, and concentrated hydrochloric acid is volatile.
Hydrogen chloride is mainly used to make dyes, perfumes, medicines, various chlorides and corrosion inhibitors.
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