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cas no. 7664-39-3
einecs no. 231-634-8
mol wt. 20.01
synonyms hydrogen fluoride; etching acid; ahf; fluorohydric acid;
fluoric acid; hf acid; acide fluorhydrique (french); acido fluoridrico (italian); fluorowodor (polish); fluorwasserstoff (german); fluorwaterstof (dutch);
physical and chemical properties (anhydrous)
physical state clear, colorless, corrosive fuming liquid
melting point -84 c
boiling point 19.5 c
specific gravity 0.97
solubility in water miscible
vapor density 2.21
nfpa ratings health: 4 ; flammability: 0; reactivity: 1
flash point not flammable
stability stable under ordinary conditions
general description & applications
hydrofluoric acid is the aqueous solution of hydrogen fluoride which is gas at room temperature (boiling point: 19 c). The pure hydrogen fluoride is a strong acid, it reacts violently with bases and is corrosive. It reacts violently with metals, glass, some forms of plastic, rubber, and coatings. Hf exists in complex of h6f6, due to hydrogen binding. The aqueous solution of hydrogen fluoride (hydrofluoric acid) is a weak acid as the high strength of hydrogen-fluorine bonds does not allow complete are dissociation with water. It is a highly corrosive, fuming, and hazardous substance that liquid and vapor can cause severe burns. Hf is prepared from the reaction of concentrated sulfuric acid on fluospar (a mineral composed of calcium fluoride, caf2).
Hydrofluoric acid is used as the catalyst of refinery alkylation. the term alkylation in petroleum refinery field is for the reaction of low olefins (typically butene) anf isoparaffins (typically isobutane) to form higher isoparaffins. Hydrofluoric acid is capable of dissolving inorganic oxides including glass (sio2), which offers following applications:
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