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Sodium aluminate
 Crystal structure with sodium in yellow, aluminium in grey, and oxygen in red[1]
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 Sodium metaaluminate sample
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| Names | |
|---|---|
| IUPAC name
Sodium aluminate
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| Other names
Sodium aluminium oxide,
Sodium metaaluminate Aluminate, ((AlO2)1−), sodium | |
| Identifiers | |
3D model (JSmol)
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| ECHA InfoCard | 100.013.728 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| NaAlO2 | |
| Molar mass | 81.97 g/mol |
| Appearance | white powder (sometimes light-yellowish) hygroscopic/ when dissolved in water a colloidal black solution is formed |
| Odor | odorless |
| Density | 1.5 g/cm3 |
| Melting point | 1,650 °C (3,000 °F; 1,920 K) |
| highly soluble | |
| Solubility | Insoluble in alcohol[2] |
Refractive index (nD)
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1.566 |
| Structure | |
| orthorhombic | |
| Thermochemistry | |
Heat capacity (C)
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73.6 J/mol K |
Std molar
entropy (S⦵298) |
70.4 J/mol K |
Std enthalpy of
formation (ΔfH⦵298) |
-1133.2 kJ/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated),[3] Na2O·Al2O3, or Na2Al2O4. Commercial sodium aluminate is available as a solution or a solid.
Other related compounds, sometimes called sodium aluminate, prepared by reaction of Na2O and Al2O3 are Na5AlO4 which contains discrete AlO45− anions, Na7Al3O8 and Na17Al5O16 which contain complex polymeric anions, and NaAl11O17, once mistakenly believed to be β-alumina, a phase of aluminium oxide.[4][5]
- ^ Kaduk, James A.; Pei, Shiyou (1995). "The Crystal Structure of Hydrated Sodium Aluminate, NaAlO2•5/4H2O, and Its Dehydration Product". Journal of Solid State Chemistry. 115 (1): 126–139. doi:10.1006/jssc.1995.1111.
- ^ The Merck Index. 10th ed. Rahway, New Jersey: Merck Co., Inc., 1983., p. 1229
- ^ "Aluminium". chemguide.co.uk.
- ^ "Identification and characterisation of three novel compounds in the sodium–aluminium–oxygen system", Marten G. Barker, Paul G. Gadd and Michael J. Begley, J. Chem. Soc., Dalton Trans., 1984, 1139–1146, doi:10.1039/DT9840001139
- ^ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
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