Title: Ammonium Fluoride
CAS Registry Number: 12125-01-8
Additional Names: Neutral ammonium fluoride
Molecular Formula: FH4N
Molecular Weight: 37.04
Percent Composition: F 51.29%, H 10.88%, N 37.82%
Line Formula: NH4F
Literature References: Prepd by passing ammonia gas into ice-cooled 40% hydrofluoric acid or by heating 1 part NH4Cl with 2.25 parts NaF and separatng the ammonium fluoride by sublimation: Kwasnik in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 183. Review: Steele, "Ammonium Fluoride" in Mellor's vol. VIII, supplement I, Nitrogen (part 1), 370-377 (1964).
Properties: Deliquescent leaflets or needles. Hexagonal prisms by sublimation. Occurs commercially as a granular powder. d 1.015. On heating dec into NH3 and HF. Corrodes glass. Soly in water (0°): 100 g/100 ml. Decomposed by hot water into NH3 and ammonium bifluoride. (NH4F.HF). Cannot be obtained by evapn of its aq soln. Slightly sol in alcohol. The aq soln is acid. May be stored in iron vessels. Incompat. Quinine salts; soluble calcium salts.
Density: d 1.015
CAUTION: Ingestion produces nausea, salivation, vomiting, abdominal pain, diarrhea, hemorrhagic gastroenteritis, muscular weakness, tremors, convulsions, vascular collapse. Increased respiration is followed by depression, death. Chronic toxicity: mottling of enamel, generalized osteosclerosis, calcification in tendons and ligaments; synostoses.
Use: Etching and frosting glass; as antiseptic in brewing beer; preserving wood; in printing and dyeing textiles; as mothproofing agent. |