Difference between revisions of "Aluminium oxide"
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==Properties== | ==Properties== | ||
===Chemical=== | ===Chemical=== | ||
| + | Aluminium oxide will react with sodium hydroxide to form sodium aluminate. | ||
===Physical=== | ===Physical=== | ||
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:M<sub>2</sub>O<sub>3</sub> + 2 Al → Al<sub>2</sub>O<sub>3</sub> + 2 M | :M<sub>2</sub>O<sub>3</sub> + 2 Al → Al<sub>2</sub>O<sub>3</sub> + 2 M | ||
| − | + | This reaction also gives various aluminates, and separating the alumina from the slag is complicated and may not worth it. | |
| + | A much better method involves the dehydration of aluminium hydroxide | ||
| + | |||
| + | ==Projects== | ||
| + | *Make aluminium salts | ||
==Handling== | ==Handling== | ||
No special handling is necessary. | No special handling is necessary. | ||
| − | |||
===Safety=== | ===Safety=== | ||
Avoid inhalating the dust. | Avoid inhalating the dust. | ||
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<references/> | <references/> | ||
===Relevant Sciencemadness threads=== | ===Relevant Sciencemadness threads=== | ||
| + | *[http://www.sciencemadness.org/talk/viewthread.php?tid=61897 Making Relatively Pure Alumina] | ||
[[Category:Chemical compounds]] | [[Category:Chemical compounds]] | ||
Revision as of 17:36, 24 February 2016
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This article is a stub. Please help Sciencemadness Wiki by expanding it, adding pictures, and improving existing text.
|
 Samples of ruby, a red variant of corundum.
| |
| Names | |
|---|---|
| IUPAC name
Dialuminum;oxygen(2-)
| |
| Systematic IUPAC name
Aluminium oxide | |
| Other names
Alumina
corundum ruby Saphire | |
| Identifiers | |
| Jmol-3D images | Image |
| |
| Properties | |
| Al2O3 | |
| Appearance | white solid |
| Density | 3.95–4.1 g/cm3 |
| Melting point | 2,072 °C (3,762 °F; 2,345 K) |
| Boiling point | 2,977 °C (5,391 °F; 3,250 K) |
| insoluble | |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Aluminium oxide or alumina is the chemical compound of aluminum and oxygen, with chemical formula Al2O3. It's the most common and stable form of the aluminium oxides. Aluminium oxide occurs naturally in it's crystalline alpha phase as mineral corundum.
Contents
Properties
Chemical
Aluminium oxide will react with sodium hydroxide to form sodium aluminate.
Physical
Aluminium oxide is very hard solid (9 Mohs scale). It's electrical insulator.
Availability
Aluminium oxide is often present in sandpapers, you can also buy it from mineral collectors as corrundum or gemstones like ruby or saphire.
Heating elements also contain alumina powder which acts as an insulator for the resistance wiring.
Preparation
Aluminium oxide is a product of thermite reaction:
- M2O3 + 2 Al → Al2O3 + 2 M
This reaction also gives various aluminates, and separating the alumina from the slag is complicated and may not worth it.
A much better method involves the dehydration of aluminium hydroxide
Projects
- Make aluminium salts
Handling
No special handling is necessary.
Safety
Avoid inhalating the dust. Aluminium oxide isn't flamable or explosive.
Storage
Storage in closed bottles is adequate.
Disposal
Aluminium oxide could be safely dumped with normal trash or spilled out in a soil.
References
Relevant Sciencemadness threads
- Article stubs
- Chemical pages without CAS Registry Number
- Articles without EBI source
- Chemical pages without ChemSpiderID
- Chemical pages without DrugBank identifier
- Articles without KEGG source
- Articles without InChI source
- Articles without UNII source
- Articles containing unverified chemical infoboxes
- Chemical compounds
- Inorganic compounds
- Aluminium compounds
- Oxides
- Materials unstable in acidic solution
- Materials unstable in basic solution
- Solids
- Minerals
