Aluminum sodium sulfate

Structural formula
General
Surname	Aluminum sodium sulfate
other names	E 521 ; Soda alum; Soda alum; SODIUM ALUM ( INCI ) ;
Molecular formula	NaAl (SO 4 ) 2 (anhydrous); NaAl (SO 4 ) 2 12 H 2 O (dodecahydrate);
Brief description	colorless solid
External identifiers / databases
EC number	233-277-3
ECHA InfoCard	100.030.239
PubChem	24939
ChemSpider	23313
Wikidata	Q413559
properties
Molar mass	242.09 g mol −1 (anhydrous); 458.29 g mol −1 (dodecahydrate);
Physical state	firmly
density	1.61 g cm −3 (dodecahydrate)
Melting point	~ 60 ° C (dodecahydrate)
solubility	soluble in water (dodecahydrate); practically insoluble in ethanol (dodecahydrate);
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Aluminum sodium sulphate ( E 521 , sodium alum ) in the form of its dodecahydrate is an alum with the composition NaAl (SO ₄ ) ₂ · 12 H ₂ O, which is used as a firming agent , acidifier and acid regulator .

Occurrence

Of course, aluminum sodium sulfate occurs as undecahydrate in the mineral mendocite NaAl (SO ₄ ) ₂ · 11 H ₂ O.

properties

Aluminum sodium sulfate is a colorless solid and a mixed salt of sulfuric acid , which contains sodium and aluminum as metals .

safety instructions

The salt is irritating to the skin, eyes and mucous membranes and can cause eczema . It is suspected of causing allergic reactions and therefore frequent consumption is not recommended. In addition, it is suspected of causing Alzheimer's disease due to aluminum exposure of the body .

Web links

Additives Online: E 521 - Aluminum Sodium Sulphate

Individual evidence

↑ Entry on E 521: Aluminum sodium sulphate in the European database for food additives, accessed on June 27, 2020.
↑ Entry on SODIUM ALUM in the CosIng database of the EU Commission, accessed on February 12, 2020.
↑ ^a ^b ^c ^d ^e David R. Lide: CRC Handbook of Chemistry and Physics A Ready-reference Book of Chemical and Physical Data . CRC Press, 1995, ISBN 978-0-8493-0595-5 , pp. 83 ( limited preview in Google Book search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ List of additives and E numbers. In: bll.de. Federation for Food Law and Food Science , accessed on March 4, 2017 .
^ DC Ayres, D. Hellier: Dictionary of Environmentally Important Chemicals , 1998, CRC Press, ISBN 0-7514-0256-7 .
↑ Salzburg Chamber of Labor ( Memento from November 28, 2007 in the Internet Archive ) (PDF; 385 kB).

[E-Nummer521-1] Entry on E 521: Aluminum sodium sulphate in the European database for food additives, accessed on June 27, 2020.

[CosIng-2] Entry on SODIUM ALUM in the CosIng database of the EU Commission, accessed on February 12, 2020.

[David_R._Lide-3] David R. Lide: CRC Handbook of Chemistry and Physics A Ready-reference Book of Chemical and Physical Data . CRC Press, 1995, ISBN 978-0-8493-0595-5 , pp. 83 ( limited preview in Google Book search).

[NV-4] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[5] List of additives and E numbers. In: bll.de. Federation for Food Law and Food Science , accessed on March 4, 2017 .

[6] DC Ayres, D. Hellier: Dictionary of Environmentally Important Chemicals , 1998, CRC Press, ISBN 0-7514-0256-7 .

[7] Salzburg Chamber of Labor ( Memento from November 28, 2007 in the Internet Archive ) (PDF; 385 kB).