6HNO₃ + Al₂O₃ = 2Al(NO₃)₃ + 3H₂O 6H⁺ + 6NO₃⁻ + Al₂O₃ = 2Al³⁺ + 6NO₃⁻ + 3H₂O 6H⁺ + Al₂O₃ = 2Al³⁺ + 3H₂O