Appearance: White crystalline solid (single crystals are transparent) ; Colourless crystals or white hygroscopic powder
HCl – Chlorane, Hydrogen chloride
Other names: Hydrochloric acid, M, Uriatic acidHydronium chloride, Chlorhydric Acid, Hydrochloric acid gas, HCl, Anhydrous hydrogen chloride, Hydrochloric acid, anhydrous, Aqueous hydrogen chloride, [Note: Often used in an aqueous solution.]
Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
Appearance: Colorless solution ; Colourless gas or colourless liquid (below 19.5 °C) ; Colourless gas or colourless fuming liquid with pungent odour ; Colourless fuming liquid with pungent odour ; Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]