Difference between revisions of "Sodium aluminium sulfate"
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| Section3 = {{Chembox Structure | | Section3 = {{Chembox Structure | ||
| − | | Reference = <ref>{{citation | last1 = Cromer | first1 = D. T. | last2 = Kay | first2 = M. I. | last3 = Larson | | + | | Reference = <ref>{{citation | last1 = Cromer | first1 = D. T. | last2 = Kay | first2 = M. I. | last3 = Larson | first3 = A. C. | title = Refinement of the alum structures. II. X-ray and neutron diffraction of NaAl(SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O, γ-alum | journal = Acta Crystallogr. | volume = 22 | issue = 2 | year = 1967 | pages = 182–87 | doi = 10.1107/S0365110X67000313}}.</ref> |
| CrystalStruct = [[Cubic crystal system|Cubic]], [[Pearson symbol|cP96]] | | CrystalStruct = [[Cubic crystal system|Cubic]], [[Pearson symbol|cP96]] | ||
| SpaceGroup = Pa<u style="text-decoration:overline">3</u>, No. 205 | | SpaceGroup = Pa<u style="text-decoration:overline">3</u>, No. 205 | ||
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'''Sodium aluminium sulfate''', NaAl(SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O or Na<sub>2</sub>SO<sub>4</sub>·Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>·24H<sub>2</sub>O, also known as '''soda alum''' or '''sodium alum''', is a form of [[alum]] used in the [[acidity regulator]] of food ([[E number|E521]]) as well as in the manufacture of [[baking powder]]. It is also a common [[mordant]] for the preparation of [[hematoxylin]] solutions for [[staining]] [[Cell nucleus|cell nuclei]] in [[histopathology]]. | '''Sodium aluminium sulfate''', NaAl(SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O or Na<sub>2</sub>SO<sub>4</sub>·Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>·24H<sub>2</sub>O, also known as '''soda alum''' or '''sodium alum''', is a form of [[alum]] used in the [[acidity regulator]] of food ([[E number|E521]]) as well as in the manufacture of [[baking powder]]. It is also a common [[mordant]] for the preparation of [[hematoxylin]] solutions for [[staining]] [[Cell nucleus|cell nuclei]] in [[histopathology]]. | ||
| − | The classical [[Cubic crystal system|cubic]] alum structure is the [[Hydrate|dodecahydrate]], which is known in [[mineralogy]] as [[alum-(Na)]].<ref>{{citation | title = Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks | first = Ernst A.J. | last = Burke | journal = Mineralogical Record | volume = 39 | issue = 2 | year = 2008 | pages = 131–35}}.</ref><ref>{{WebMineral-ref | name = Alum-(Na) | url = http://webmineral.com/data/Alum-%28Na%29.shtml | accessdate = 2009-11-28}}.{{MinDat-ref | name = Alum-(Na) | id = 3703 | accessdate = 2009-11-28}}.</ref> Two other rare mineral forms are known: [[mendozite]] (undecahydrate)<ref>{{WebMineral-ref | name = Mendozite | url = http://webmineral.com/data/Mendozite.shtml | accessdate = 2009-11-28}}.{{MinDat-ref | name = Mendozite | id = 2643 | accessdate = 2009-11-28}}.</ref> and [[tamarugite]] (hexahydrate).<ref>{{WebMineral-ref | name = Tamarugite | url = http://www.webmineral.com/data/Tamarugite.shtml | accessdate = 2009-11-28}}.{{MinDat-ref | name = Tamarugite | id = 3878 | accessdate = 2009-11-28}}.</ref> | + | The classical [[Cubic crystal system|cubic]] alum structure is the [[Hydrate|dodecahydrate]], which is known in [[mineralogy]] as [[alum-(Na)]].<ref>{{citation | title = Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks | url = http://pubsites.uws.edu.au/ima-cnmnc/tidyingupnames.pdf | first = Ernst A.J. | last = Burke | journal = Mineralogical Record | volume = 39 | issue = 2 | year = 2008 | pages = 131–35}}.</ref><ref>{{WebMineral-ref | name = Alum-(Na) | url = http://webmineral.com/data/Alum-%28Na%29.shtml | accessdate = 2009-11-28}}. {{MinDat-ref | name = Alum-(Na) | id = 3703 | accessdate = 2009-11-28}}.</ref> Two other rare mineral forms are known: [[mendozite]] (undecahydrate)<ref>{{WebMineral-ref | name = Mendozite | url = http://webmineral.com/data/Mendozite.shtml | accessdate = 2009-11-28}}. {{MinDat-ref | name = Mendozite | id = 2643 | accessdate = 2009-11-28}}.</ref> and [[tamarugite]] (hexahydrate).<ref>{{WebMineral-ref | name = Tamarugite | url = http://www.webmineral.com/data/Tamarugite.shtml | accessdate = 2009-11-28}}. {{MinDat-ref | name = Tamarugite | id = 3878 | accessdate = 2009-11-28}}.</ref> |
==References== | ==References== | ||
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[[Category:Sodium compounds]] | [[Category:Sodium compounds]] | ||
[[Category:Sulfates]] | [[Category:Sulfates]] | ||
| + | [[Category:Acidity regulators]] | ||
{{Imported from Wikipedia|name=Sodium aluminium sulfate|id=328565514}} | {{Imported from Wikipedia|name=Sodium aluminium sulfate|id=328565514}} | ||
Latest revision as of 03:09, 30 November 2009
"Sodium alum" redirects here. For the mineral form, see Alum-(Na).
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Sodium aluminium sulfate, NaAl(SO4)2·12H2O or Na2SO4·Al2(SO4)3·24H2O, also known as soda alum or sodium alum, is a form of alum used in the acidity regulator of food (E521) as well as in the manufacture of baking powder. It is also a common mordant for the preparation of hematoxylin solutions for staining cell nuclei in histopathology.
The classical cubic alum structure is the dodecahydrate, which is known in mineralogy as alum-(Na).[3][4] Two other rare mineral forms are known: mendozite (undecahydrate)[5] and tamarugite (hexahydrate).[6]
References
- ↑ 1.0 1.1 CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-146. ISBN 0-8493-0462-8.
- ↑ Cromer, D. T.; Kay, M. I.; Larson, A. C. Refinement of the alum structures. II. X-ray and neutron diffraction of NaAl(SO4)2·12H2O, γ-alum. Acta Crystallogr. 1967, 22 (2), 182–87. DOI: 10.1107/S0365110X67000313.
- ↑ Burke, Ernst A.J. Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. Mineralogical Record 2008, 39 (2), 131–35, <http://pubsites.uws.edu.au/ima-cnmnc/tidyingupnames.pdf>.
- ↑ Alum-(Na), <http://webmineral.com/data/Alum-%28Na%29.shtml> (accessed 28 November 2009), WebMineral.com. Alum-(Na), <http://www.mindat.org/show.php?id=3703> (accessed 28 November 2009), MinDat.org.
- ↑ Mendozite, <http://webmineral.com/data/Mendozite.shtml> (accessed 28 November 2009), WebMineral.com. Mendozite, <http://www.mindat.org/show.php?id=2643> (accessed 28 November 2009), MinDat.org.
- ↑ Tamarugite, <http://www.webmineral.com/data/Tamarugite.shtml> (accessed 28 November 2009), WebMineral.com. Tamarugite, <http://www.mindat.org/show.php?id=3878> (accessed 28 November 2009), MinDat.org.
External links
- NIOSH Pocket Guide to Chemical Hazards 0024
- IPCS Environmental Health Criteria 194: Aluminium
- NLM Hazardous Substances Data Bank entry for Sodium alum
- FAO/WHO Joint Expert Committee on Food Additives (JECFA) monograph: Aluminium (WHO Food Additives Series 24)
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This page was originally imported from Wikipedia, specifically this version of the article "Sodium aluminium sulfate". Please see the history page on Wikipedia for the original authors. This WikiChem article may have been modified since it was imported. It is licensed under the Creative Commons Attribution–Share Alike 3.0 Unported license. |
