Ammonium hexafluoroarsenate is an inorganic chemical compound with the chemical formula NH4AsF6.[1][2]
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3D model (JSmol)
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| Properties | |
| AsF6H4N | |
| Molar mass | 206.951 g·mol−1 |
| Appearance | colourless crystals |
| Density | 2.769 g/cm3 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
editArsenic pentoxide is mixed with an excess of ammonium fluoride; the mixture is fused to produce ammonium hexafluoroarsenate:
- AsF5 + NH4F → NH4AsF6
Also, reaction of arsenic trifluoride, hydrofluoric acid, and ammonia:[dubious – discuss]
- AsF3 + HF + NH4 → NH4AsF6
Treatment of hexafluoroarsenic acid and ammonia:
- HAsF6 + NH3 → NH4AsF6
Physical properties
editAmmonium hexafluoroarsenate crystallizes rhombohedral with the KOsF6 structure type, with parameters: a = 7.459(3) Å, c = 7.543(3) Å (at 200 K), Z = 3, unit cell volume 363.4 Å3, space group R3 (No. 148).[3]
References
edit- ^ Desmarteau, Darryl D.; Lam, William Y.; O'Brien, Brian A.; Chang, Shi-Ching (1 July 1984). "Novel ammonium hexafluoroarsenate salts from reaction of (CF3)2NH, CF3N(OCF3)H, CF3N[OCF(CF3)2]H, CF3NHF and SF5NHF with the strong acid HF/ASF5". Journal of Fluorine Chemistry. 25 (3): 387–394. doi:10.1016/S0022-1139(00)81212-9. ISSN 0022-1139. Retrieved 4 September 2024.
- ^ Yaws, Carl L. (6 January 2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics. Gulf Professional Publishing. p. 731. ISBN 978-0-12-801146-1. Retrieved 4 September 2024.
- ^ Goreshnik, E.; Mazej, Z. (July 2007). "X–ray Single Crystal Structure and Raman Spectrum of Ammonium Hexafluoroarsenate". Zeitschrift für anorganische und allgemeine Chemie. 633 (8): 1271–1273. doi:10.1002/zaac.200700043. ISSN 0044-2313. Retrieved 4 September 2024.