Ammonium hexafluoroarsenate is an inorganic chemical compound with the chemical formula .
Synthesis Arsenic pentoxide is mixed with an excess of ammonium fluoride; the mixture is fused to produce ammonium hexafluoroarsenate:
Also, reaction of arsenic trifluoride, hydrofluoric acid, and ammonia:
Treatment of hexafluoroarsenic acid and ammonia:
Physical properties Ammonium hexafluoroarsenate crystallizes rhombohedral with the 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 R (No. 148).
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