Barium Hexafluorosilicate
Title: Barium Hexafluorosilicate
CAS Registry Number: 17125-80-3
Additional Names: Barium fluosilicate; barium silicofluoride
Molecular Formula: BaF6Si
Molecular Weight: 279.40
Percent Composition: Ba 49.15%, F 40.80%, Si 10.05%
Line Formula: BaSiF6
Literature References: Prepd from BaCl2 and H2SiF6: Truchot, Compt. Rend. 98, 821 (1884); Hoffmann, Gutowsky, Inorg. Synth. 4, 145 (1953).
Properties: Orthorhombic needles. d421 4.29. Dec at 300°. Heat of formation (solid) -677.42 kcal/mol. Soly in water (g/100 ml H2O): 0.015 (0°); 0.0235 (25°); 0.091 (100°). Prolonged contact with water produces hydrolysis which is much accelerated by the presence of alkali. Slightly sol in dil acids; sol in ammonium chloride soln; practically insol in alc.
Density: d421 4.29
CAUTION: Highly toxic, especially when brought into soln by alkali.
Use: Prepn of silicon tetrafluoride; as pesticide.

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