Ammonium hexafluoroaluminate

Ammonium hexafluoroaluminate
Ammonium hexafluoroaluminate
General
Systematic ; name	Ammonium hexafluoroaluminate
Traditional names	Ammonium Fluoride
Chem. formula	(NH 4 ) 3 [AlF 6 ]
Physical properties
condition	Colorless crystals
Molar mass	195.09 g / mol
Density	1.78; 1.837 g / cm³
Thermal properties
T. melt.	126.1 ° C
T. bale.	239.5 ° C
Enthalpy of Education	-3060 kJ / mol
Chemical properties
Solubility in water	8.3 25 g / 100 ml
Classification
Reg. CAS number	7784-19-2
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider

Ammonium hexafluoroaluminate is an inorganic substance, a mixed salt of hydrofluoric acid , aluminum and ammonium , with the formula (NH ₄ ) ₃ [AlF ₆ ]. Colorless crystals soluble in water.

Content

1 Receiving
2 Physical properties
3 Chemical properties
4 Application
5 Literature

Getting

By the interaction of aluminum oxide or hydroxide with ammonium fluoride or hydrofluoride :

{\mathsf {Al_{2}O_{3}+12NH_{4}F\ {\xrightarrow {}}\ 2(NH_{4})_{3}[AlF_{6}]+6NH_{3}+3H_{2}O}}

{\ displaystyle {\ mathsf {Al_ {2} O_ {3} + 12NH_ {4} F \ {\ xrightarrow {}} \ 2 (NH_ {4}) _ {3} [AlF_ {6}] + 6NH_ {3 } + 3H_ {2} O}}}

{\mathsf {Al(OH)_{3}+3NH_{4}HF_{2}\ {\xrightarrow {}}\ (NH_{4})_{3}[AlF_{6}]+3H_{2}O}}

{\ displaystyle {\ mathsf {Al (OH) _ {3} + 3NH_ {4} HF_ {2} \ {\ xrightarrow {}} \ (NH_ {4}) _ {3} [AlF_ {6}] + 3H_ {2} O}}}

Physical Properties

Ammonium hexafluoroaluminate forms colorless crystals of cubic syngony , space group F 4 3m , cell parameters a = 0.842 nm, Z = 4.

Chemical Properties

When heated, decompose sequentially:

{\mathsf {(NH_{4})_{3}[AlF_{6}]{\xrightarrow[{-NH_{3},HF}]{T^{o}C}}NH_{4}[AlF_{4}]{\xrightarrow[{-NH_{3},HF}]{T^{o}C}}AlF_{3}}}

{\ displaystyle {\ mathsf {(NH_ {4}) _ {3} [AlF_ {6}] {\ xrightarrow [{- NH_ {3}, HF}] {T ^ {o} C}} NH_ {4} [AlF_ {4}] {\ xrightarrow [{- NH_ {3}, HF}] {T ^ {o} C}} AlF_ {3}}}}

Application

An intermediate in the production of AlF ₃ .

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1988. - T. 1. - 623 p.
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 2nd ed., rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.
Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.

Ammonium hexafluoroaluminate
General
Systematic name	Ammonium hexafluoroaluminate
Traditional names	Ammonium Fluoride
Chem. formula	(NH ₄ ) ₃ [AlF ₆ ]
Physical properties
condition	Colorless crystals
Molar mass	195.09 g / mol
Density	1.78; 1.837 g / cm³
Thermal properties
T. melt.	126.1 ° C
T. bale.	239.5 ° C
Enthalpy of Education	-3060 kJ / mol
Chemical properties
Solubility in water	8.3 ²⁵ g / 100 ml
Classification
Reg. CAS number	7784-19-2
PubChem
Reg. EINECS number
Smiles
Inchi
ChemSpider