Aluminum ammonium sulfate dodecahydrate

Structural formula
${\displaystyle \mathrm {\ {\Biggl [}} }$ ${\displaystyle \mathrm {\ \!\ {\Biggr ]}_{2}} }$ • 12 H 2 O
General
Surname	Aluminum ammonium sulfate dodecahydrate
other names	Ammonium alum
Molecular formula	NH 4 Al (SO 4 ) 2 • 12 H 2 O
Brief description	colorless and odorless crystals
External identifiers / databases
CAS number 7784-26-1 (dodecahydrate) 7784-25-0 (anhydrous) EC number 616-522-2 ECHA InfoCard 100.112.599 PubChem 62668 Wikidata Q27261814
properties
Molar mass	453.33 g mol −1
Physical state	firmly
density	1.64 g cm −3
Melting point	93.5 ° C
solubility	150 g l −1 in water (20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium Aluminum Sulfate , molecular formula: NH ₄ Al (SO ₄ ) ₂ · 12 H ₂ O, common name: ammonium alum, also as an ingredient of cosmetics as Ammonium Alum is designated, an ammonium - aluminum - double salt , the crystal water contains. It forms water-soluble, colorless cubic crystals with a relative molecular mass M _r of 453.33, a density of 1.64 g / cm³ and a melting point of 93.5 ° C.

use

Ammonium alum is used in many ways, including in deodorants , the paper industry , tannery , for water purification or the production of caustic or flame retardants , in medicine as an astringent and in the cosmetics industry as a so-called " deocrystal ". In the food industry it is used as a firming agent and stabilizer . It is approved in the EU as a food additive under the designation E 523 with a permitted daily dose of one milligram of aluminum per kilogram of body weight.

See also

Alum stone

Individual evidence

1. ↑ ^{a b c d e} Entry on ammonium aluminum sulfate in the GESTIS material database of the IFA , accessed on June 3, 2018(JavaScript required) .
2. ↑ External identifiers or database links for aluminum ammonium sulfate anhydrate : CAS number: 7784-25-0, EC number: 232-055-3, ECHA InfoCard: 100.029.141 , GESTIS substance database : 4020 , PubChem : 24566 , ChemSpider : 2297489 , Wikidata : Q419370 .
3. ^ Otto Helmboldt, L. Keith Hudson, Chanakya Misra, Karl Wefers, Wolfgang Heck: Aluminum Compounds, Inorganic . In: Ullmann's Encyclopedia of Industrial Chemistry . Wiley-VCH Verlag GmbH & Co. KGaA, 2000, ISBN 978-3-527-30673-2 , doi : 10.1002 / 14356007.a01_527.pub2 .