Difference between revisions of "Sodium aluminium sulfate"

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   }}
 
   }}
 
| Section3 = {{Chembox Structure
 
| Section3 = {{Chembox Structure
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|  Reference = <ref>{{citation | last1 = Cromer | first1 = D. T. | last2 = Kay | first2 = M. I. | last3 = Larson | first2 = 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, &gamma;-alum | journal = Acta Crystallogr. | volume = 22 | issue = 2 | year = 1967 | pages = 182–87 | doi = 10.1107/S0365110X67000313}}.</ref>
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|  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, &gamma;-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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|  CASNo = 10102-71-3<!--from ESIS and CHRIP-->
 
|  CASNo = 10102-71-3<!--from ESIS and CHRIP-->
 
|  EC-number = 233-277-3
 
|  EC-number = 233-277-3
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|  ChemSpiderID =  
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|  ChemSpiderID = 23313
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|  InChI =  
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|  InChI = 1/Al.Na.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p-​4
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|  InChIKey =  
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|  InChIKey = GJPYYNMJTJNYTO-XBHQNQODAI
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|  StdInChI =  
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|  StdInChI = 1S/Al.Na.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p​-4
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|  StdInChIKey =  
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|  StdInChIKey = GJPYYNMJTJNYTO-UHFFFAOYSA-J
 
   }}
 
   }}
 
| Section2 = {{Chembox Properties
 
| Section2 = {{Chembox Properties
 
|  Reference = <ref name="RubberBible"/>
 
|  Reference = <ref name="RubberBible"/>
 
|  Formula = NaAl(SO<sub>4</sub>)<sub>2</sub>
 
|  Formula = NaAl(SO<sub>4</sub>)<sub>2</sub>
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|  MolarMass =  
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|  MolarMass = 242.10 g/mol
 
|  Appearance = while crystalline powder
 
|  Appearance = while crystalline powder
 
|  Solubility = 110 g/100 ml  (15 °C)
 
|  Solubility = 110 g/100 ml  (15 °C)
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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]]
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[[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).
Sodium aluminium sulfate dodecahydrate
IUPAC name Aluminium sodium bis(sulfate) — water (1:12)
Other names Sodium alum
Soda alum
E521
Identifiers
InChI InChI=1/Al.Na.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,​2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4
InChIKey ZEMWIYASLJTEHQ-XBHQNQODAL
Standard InChI InChI=1S/Al.Na.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1​,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4
Standard InChIKey ZEMWIYASLJTEHQ-UHFFFAOYSA-J
CAS number [7784-28-3]
EC number 233-277-3
ChemSpider 22972
Properties[1]
Chemical formula NaAl(SO4)2·12H2O
Molar mass 458.28 g/mol
Appearance while crystalline powder
Density 1.6754 (20 °C)
Melting point

61 °C

Solubility in water 208 g/100 ml (15 °C)
Refractive index (nD) 1.4388
Structure[2]
Crystal structure Cubic, cP96
Space group Pa3, No. 205
Lattice constant a = 1221.4 pm
Coordination geometry Octahedral (Na+)
Octahedral (Al3+)
Hazards
EU index number not listed
Flash point non-flammable
Related compounds
Other cations Ammonium aluminium sulfate
Potassium aluminium sulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Sodium aluminium sulfate (anhydrous)
IUPAC name Aluminium sodium bis(sulfate)
Identifiers
InChI InChI=1/Al.Na.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p-​4
InChIKey GJPYYNMJTJNYTO-XBHQNQODAI
Standard InChI InChI=1S/Al.Na.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p​-4
Standard InChIKey GJPYYNMJTJNYTO-UHFFFAOYSA-J
CAS number [10102-71-3]
EC number 233-277-3
ChemSpider 23313
Properties[1]
Chemical formula NaAl(SO4)2
Molar mass 242.10 g/mol
Appearance while crystalline powder
Solubility in water 110 g/100 ml (15 °C)
Hazards
EU index number not listed
Flash point non-flammable
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

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. ↑ 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.
  2. ↑ 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.
  3. ↑ 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>.
  4. ↑ 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.
  5. ↑ 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.
  6. ↑ 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

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