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Sodium fluoride - Wikipedia, the free encyclope <br />Sodium fluoride <br />From Wikipedia, the free encyclopedia <br />Sodium fluoride is an inorganic chemical compound with the formula <br />NaF. A colorless solid, it is a source of the fluoride ion in diverse <br />applications. Sodium fluoride is less expensive and less hygroscopic <br />than the related salt potassium fluoride. <br />F <br />Contents <br />■ 1 Structure, general properties, occurrence <br />■ 2 Production <br />■ 3 Applications <br />■ 4 Safety <br />■ 5 See also <br />■ 6 References <br />Structure, general properties, occurrence <br />Sodium fluoride is an ionic compound, dissolving to give separated <br />Na+ and F ions. Like sodium chloride, it crystallizes in a cubic motif <br />where both Na+ and F occupy octahedral coordination sites.[3][4] <br />The mineral form of NaF, villiaumite, is moderately rare. It is known <br />from plutonic nepheline syenite rocks.[5] <br />Production <br />NaF is prepared by neutralizing hydrofluoric acid or hexafluorosilicic <br />acid (H2SiF6), byproducts of the production of superphosphate <br />fertilizer. Neutralizing agents include sodium hydroxide and sodium <br />carbonate. Alcohols are sometimes used to precipitate the NaF: <br />HF + NaOH —+ NaF + H2O <br />From solutions containing HF, sodium fluoride precipitates as the <br />bifluoride salt NaHF2. Heating the latter releases HF and gives Nal'. <br />HF + NaF ;i-- NaHF2 <br />In a 1986 report, the annual worldwide consumption of NaF was <br />estimated to be several million tonnes.[61 <br />Applications <br />http://en.wildpedia.org(wiki/Sodium fluoride <br />Sodium fluoride <br />IUPAC name <br />Sodium fluoride <br />Other names <br />Florocid <br />Identifiers <br />CAS number <br />7681-49-4 <br />PubChem <br />5235 <br />ChemSpider <br />5045 <br />UNII <br />8ZYQ1474W7 " <br />EC number <br />231-667-8 <br />UN number <br />1690 <br />ChEMBL <br />CHIEMBLI528x <br />RTECS <br />number <br />WB0350000 <br />ATC code <br />A01AA01 (http://www.whocc.no <br />/atc ddd_index/?code=AOIAA01) <br />Jmol-3D <br />images <br />Image 1 (http://chemapps.stolafedu <br />/jmol/jmol.php?model�/o5BF "/o5D.%5BN <br />%2B%5D) <br />SMILES <br />Inchl <br />Properties <br />Molecular <br />formula <br />NaF <br />Molar mass <br />41.988713 g/mol <br />Appearance <br />White solid <br />Odor <br />odorless <br />Density <br />2.558 g/cm3 <br />Melting <br />point <br />993 °C <br />I o f 3 4/16/2011 11:01 PM <br />