What is Al2O3? Important knowledge about Al2O3.

  1. Definition of Al2O3

    • Common name: Aluminum oxide, Aluminum trioxide, Bauxite.
    • English name: Aluminium oxide, Alumina.
    • Atomic composition: Al2O3 consists of 2 aluminum atoms (Al) and 3 oxygen atoms (O).
    • Molar mass: 101.96 g/mol.
    • Molecular structure: In Al2O3 molecule, 2 aluminum atoms are bonded with 3 oxygen atoms, forming a layered structure.
    • Ion structure: Al2O3 does not contain individual ions, but forms a network structure of covalent bonds.

  2. Properties of Al2O3

    • Physical properties: Al2O3 is solid, colorless, odorless and has a neutral pH.
    • Chemical properties: Al2O3 is insoluble in water, soluble in strong acids and bases. It does not react with air at room temperature.

  3. Common chemical equations

    • Al2O3 does not react with metals, acids, and non-metals at room temperature.
    • Al2O3 can react with salts in strong acid or base environments.

  4. Preparation of Al2O3

    • In the laboratory: Al2O3 is usually prepared from aluminum salts by heating them in air.
    • In industry: The main method of producing Al2O3 is through the Bayer process, in which bauxite (the main raw material containing Al2O3) is treated with sodium hydroxide.

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