Potassium Bifluoride
Title: Potassium Bifluoride
CAS Registry Number: 7789-29-9
Additional Names: Potassium acid fluoride; potassium hydrogen fluoride
Molecular Formula: F2HK
Molecular Weight: 78.10
Percent Composition: F 48.65%, H 1.29%, K 50.06%
Line Formula: KF.HF
Literature References: Prepd according to the eq KOH + 2HF = KHF2 + H2O: Lange, Eichler, Z. Phys. Chem. 129, 285 (1927); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 237. Made commercially from potassium carbonate and hydrofluoric acid.
Properties: Tetragonal crystals. Poisonous! d 2.37. mp 238.7°. Transformation pt 195°. Soly in water (g/100 ml): 30.1 (10°); 39.2 (20°); 114.0 (80°). Sol in dil alc. Insol in abs alc.
Melting point: mp 238.7°
Density: d 2.37
CAUTION: Corrosive and irritating to skin, mucous membranes.
Use: In the prepn of pure potassium fluoride; as an electrolyte in the manuf of fluorine; frosting glass; treating coal to prevent slag formation; flux for silver solders; catalyst in the alkylation of benzene with olefins.

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