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Potassium borofluoride, KBF4

Potassium borofluoride, KBF4, may be prepared as follows: - Boric acid (1 part) and calcium fluoride (2.5 parts) are heated with boiling sulphuric acid (5.25 parts). The liquid is cooled and filtered, and a solution of a potassium salt added. Potassium borofluoride is precipitated; it is re- crystallised from hot water. Thus obtained, it forms anhydrous, shining, six-sided, prismatic crystals of density 2.5, and is orthorhombic (a:b:c = 0.7898:1:1.2830), being isomorphous with the rubidium salt, RbBF4 (a:b:c = 0.8067:1:1.2948; density = 2.820). When prepared from hydrofluoric acid, boric acid, and potassium carbonate, however, it forms a gelatinous mass which is converted at 100° into crystals belonging to the cubic system and showing the faces of the octahedron and dodecahedron.

The following borofluorides are also known (Berzelius): -

LiBF4; CsBF4; Ca(BF4)2.xH2O; Pb(BF4)2; NaBF4; (NH4)BF4; Ba(BF4)2.H2O; Cu(BF4)2; KBF4; Mg(BF4)2.xH2O; Al(BF4)3.xH2O; RbBF4; Zn(BF4)2; Y(BF4)3.xH2O

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