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Al₂O₃ + 3H₂SO₄ ---> Al₂(SO₄)₃ + 3H₂O
Al₂O₃ + 6H⁺ + 3SO₄²⁻ ---> 2Al³⁺ + 3SO₄²⁻ + 3H₂O
Al₂O₃ + 6H⁺ ---> 2Al³⁺ + 3H₂O
b)
Al₂O₃ + 3H₂O + 2NaOH ---> 2Na[Al(OH)₄]
Al₂O₃ + 3H₂O + 2Na⁺ + 2OH⁻ ---> 2Na⁺ + 2[Al(OH)₄]⁻
Al₂O₃ + 3H₂O + 2OH⁻ ---> 2[Al(OH)₄]⁻