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Mg(OH)₂ + H₂SO₄ -> MgSO₄ + 2H₂O
Mg(OH)₂ + 2H⁺ + SO₄²⁻ -> Mg²⁺ + SO₄²⁻ + 2H₂O
Mg(OH)₂ + 2H⁺ -> Mg²⁺ + 2H₂O
b) glin + kwas solny
2Al + 6HCl -> 2AlCl₃ + 3H₂
2Al°+ 6H⁺ + 6Cl⁻ -> 2Al³⁺ + 6Cl⁻ + 3H₂
2Al° + 6H⁺ -> 2Al³⁺ + 3H₂
c) tlenek magnezu + kwas azotowy (V)
MgO + 2HNO₃ -> Mg(NO₃)₂ + H₂O
MgO + 2H⁺ + 2NO₃⁻ -> Mg²⁺ + 2NO₃⁻ + H₂O
MgO + 2H⁺ -> Mg²⁺ + H₂O
d) chlorek żelaza (III) + kwas fosforowy (V)
FeCl₃ + H₃PO₄ -> FePO₄ + 3HCl
Fe³⁺ + 3Cl⁻ + 3H⁺ + PO₄³⁻ -> FePO₄ + 3H⁺ + 3Cl⁻
Fe³⁺ + PO₄³⁻ -> FePO₄