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Ammonium fluorosilicate

Ammonium fluorosilicate
Ball-and-stick model for a unit cell.
Two crystals with small light yellow-orange ice-like grains twining side-by-side, but a clear gap between; selenium contamination darkens the left one.
Names
IUPAC name
Ammonium hexafluorosilicate
Other names
Ammonium fluorosilicate

Ammonium fluosilicate

Ammonium silicofluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.229 Edit this at Wikidata
EC Number
  • 240-968-3
RTECS number
  • VV7800000
UNII
UN number 2854
  • InChI=1S/F6Si.2H3N/c1-7(2,3,4,5)6;;/h;2*1H3/q-2;;/p+2 checkY
    Key: ITHIMUMYFVCXSL-UHFFFAOYSA-P checkY
  • InChI=1/F6Si.2H3N/c1-7(2,3,4,5)6;;/h;2*1H3/q-2;;/p+2
    Key: ITHIMUMYFVCXSL-SKRXCDHZAK
  • F[Si-2](F)(F)(F)(F)F.[NH4+].[NH4+]
  • [NH4+].[NH4+].F[Si--](F)(F)(F)(F)F
Properties
(NH4)2[SiF6]
Appearance White crystals
Density 2.0 g cm−3
Melting point 100 °C (212 °F; 373 K) (decomposes)[1]
Solubility dissolves in water and alcohol
Related compounds
Other cations
 Hexafluorosilicic acid

Sodium fluorosilicate

Hazards[2][3]
GHS labelling:
Corrosive Acute Toxicity target organ toxicity
Danger
H301, H311, H315, H319, H331, H335, H372
P260, P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P312, P314, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard ACID: Acid
3
0
0
ACID
Safety data sheet (SDS) ChemicalBook MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Ammonium fluorosilicate (also known as ammonium hexafluorosilicate, ammonium fluosilicate or ammonium silicofluoride) has the formula (NH4)2SiF6. It is a toxic chemical, like all salts of fluorosilicic acid.[4] It is made of white crystals,[5] which have at least three polymorphs[6] and appears in nature as rare minerals cryptohalite or bararite.

  1. ^ ammonium silicofluoride
  2. ^ "Ammonium Hexafluorosilicate". PubChem. National Institute of Health. Retrieved October 12, 2017.
  3. ^ "SAFETY DATA SHEET Ammonium hexafluorosilicate, 99.999%". Fisher Scientific. Archived from the original on 2017-10-16. Retrieved October 15, 2017.
  4. ^ Wiberg, E., Wiberg, N., and Holleman, A. F. (2001) Inorganic chemistry. Academic Press, San Diego.
  5. ^ Cite error: The named reference Cameo was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Boldyreva was invoked but never defined (see the help page).
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