Potassium Fluoride
Title: Potassium Fluoride
CAS Registry Number: 7789-23-3
Molecular Formula: FK
Molecular Weight: 58.10
Percent Composition: F 32.70%, K 67.29%
Line Formula: KF
Literature References: Prepd by thermal decompn of KHF2 or by neutralizing HF with K2CO3: Lange, Eichler, Z. Phys. Chem. 129, 285, 286 (1927); Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 236. Toxicity data: Simonin, C.R. Seances Soc. Biol. Ses Fil. 124, 133 (1937).
Properties: Cubic crystals (NaCl lattice). Usually obtained as white, deliquesc powder or solid. Poisonous! d 2.481. mp 859.9°. bp 1505°. Soly in water (g/100 ml): 92.3 (18°); 96.4 (21°). Very freely sol in boiling water. Also sol in aq HF, liq NH3. Insol in alcohol unless water is present. May be stored in aluminum containers. Attracts moisture from the air. Aq solns corrode glass and porcelain. MLD in guinea pigs (mg/kg): 250 orally, 350 s.c.; in frogs (mg/kg): 375 s.c. (Simonin).
Melting point: mp 859.9°
Boiling point: bp 1505°
Density: d 2.481
Toxicity data: MLD in guinea pigs (mg/kg): 250 orally, 350 s.c.; in frogs (mg/kg): 375 s.c. (Simonin)
 
Derivative Type: Dihydrate
Properties: Monoclinic crystals, mp 41°. Soly in water (18°): 349.3 g/l00 ml.
Melting point: mp 41°
 
Derivative Type: Tetrahydrate
Properties: Crystals, mp 19.3°.
Melting point: mp 19.3°
 
CAUTION: Irritating to skin, eyes, mucous membranes.
Use: In the fluorination of organic compds; in flux for hard solder; to prevent unwanted fermentations; in insecticide formulations; for frosting glass.

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