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Aluminium hydroxide

IUPAC: aluminum trihydroxide

Al(OH)3 Inorganic Compounds CAS 21645-51-2
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Quick Reference
Formula / NotationAl(OH)3
CAS Number21645-51-2
Molecular Weight78.004
Melting Point300 °C
Density2.42 g/cu cm
SolubilityInsoluble in water; soluble in alkaline solutions, acid solutions
AppearanceWhite solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]
Also Known Asaluminum trihydroxide; Hydrated alumina; Amphojel; aluminum hydrate; Dried aluminium hydroxide; Aluminum hydroxide, dried; ALternaGEL; Aluminium hydroxide, dried; Alu-Cap; Aluminum hydroxide gel, dried
CategoryInorganic Compounds

What is Aluminium hydroxide?

Aluminium hydroxide (Al(OH)3) is an inorganic compound that appears as White solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]. It has a molecular weight of 78.004 g/mol. Its IUPAC name is aluminum trihydroxide. Melting point: 300 °C.

Formula & Notation

Al(OH)3

IUPAC Name: aluminum trihydroxide

Other Names / Synonyms: aluminum trihydroxide; Hydrated alumina; Amphojel; aluminum hydrate; Dried aluminium hydroxide; Aluminum hydroxide, dried; ALternaGEL; Aluminium hydroxide, dried; Alu-Cap; Aluminum hydroxide gel, dried

Properties & Characteristics

Appearance: White solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]. Molecular formula: AlH3O3. Molecular weight: 78.004 g/mol. Melting point: 300 °C. Density: 2.42 g/cu cm. Solubility: Insoluble in water; soluble in alkaline solutions, acid solutions. Vapor pressure: Vapor pressure, Pa at 20 °C:.

Physical Data

PropertyValue
Melting Point300 °C
Density2.42 g/cu cm
Molecular Weight78.004
SolubilityInsoluble in water; soluble in alkaline solutions, acid solutions
AppearanceWhite solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]

Uses & Applications

Used in industrial processes, materials science, semiconductor manufacture, ceramics, or as a catalyst.

Safety Information

May be corrosive, toxic, or an oxidising agent. Handle in well-ventilated area. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Aluminium hydroxide
Formula Al(OH)3
CAS Number 21645-51-2
Molecular Weight 78.004
Synonyms aluminum trihydroxide; Hydrated alumina; Amphojel; aluminum hydrate; Dried aluminium hydroxide; Aluminum hydroxide, dried; ALternaGEL; Aluminium hydroxide, dried; Alu-Cap; Aluminum hydroxide gel, dried

Frequently Asked Questions

Aluminium hydroxide (Al(OH)3) is an inorganic compound that appears as White solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]. It has a molecular weight of 78.004 g/mol. Its IUPAC name is aluminum trihydroxide. Melting point: 300 °C.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.