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COMPOUND

PREPARATION

PROPERTIES

Aluminium oxide or alumina (Al₂O₃)

Al₂SO_4è Al₂O₃ + 3SO₃

• White Crystalline and very stable
• Amphoteric Oxide

Al₂O₃+ 6HCl è 2AlCl₃ + 3H₂O

Al₂O₃+ 2NaOH è 2NaAlO₂ + H₂O

Aluminium Chloride (AlCl₃)

2Al + 6HCl è 2AlCl₃ + 3H₂

Al(OH)₃ + 3HCl è AlCl₃ + 3H₂O

• White crystalline, hygroscopic substance.
• Soluble in water and organic solvents.
• AlCl3 + 3H2O è Al(OH)₃ + 3HCl

It fumes in moist air due to the production of HCl.

M₂SO₄.M₂‘(SO₄)₃.24H₂O

K₂SO₄+Al₂(SO₄)₃+24H₂Oè K₂SO₄.Al₂(SO₄)₃.24H₂O

Potash alum is a white crystalline compound

It is soluble in water

It loses its water of crystallisation on heating