Aluminium hydroxide
| Names | |
|---|---|
| Preferred IUPAC name
Aluminium hydroxide | |
| Systematic IUPAC name
Trihydroxidoaluminium | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| DrugBank | |
| ECHA InfoCard | 100.040.433 |
| KEGG | |
PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Al(OH)3 | |
| Molar mass | 78.003 g·mol−1 |
| Appearance | White amorphous powder |
| Density | 2.42 g/cm3, solid |
| Melting point | 300 °C (572 °F; 573 K) |
| 0.0001 g/(100 mL) | |
Solubility product (Ksp) |
3×10−34 |
| Solubility | soluble in acids and alkalis |
| Acidity (pKa) | >7 |
| Isoelectric point | 7.7 |
| Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
−1277 kJ·mol−1 |
| Pharmacology | |
| A02AB01 (WHO) | |
| Hazards | |
| GHS labelling: | |
| no GHS pictograms | |
| no hazard statements | |
| P261, P264, P271, P280, P304+P340, P305+P351+P338, P312, P337+P313 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
>5000 mg/kg (rat, oral) |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
None |
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Aluminium hydroxide, Al(OH)3, is found as the mineral gibbsite (also known as hydrargillite) and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite. Aluminium hydroxide is amphoteric, i.e., it has both basic and acidic properties. Closely related are aluminium oxide hydroxide, AlO(OH), and aluminium oxide or alumina (Al2O3), the latter of which is also amphoteric. These compounds together are the major components of the aluminium ore bauxite. Aluminium hydroxide also forms a gelatinous precipitate in water.