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K⁺ + OH⁻ + H⁺ + NO₃⁻→ K⁺ + NO₃⁻ + H₂O°
OH⁻ + H⁺→ H₂O°
b) Fe + H₂SO₄→ FeSO₄ + H₂
Fe° + 2 H⁺ + SO₄²⁻→ Fe²⁺ + SO₄²⁻ + H₂°
Fe° + 2 H⁺ → Fe²⁺+ H₂°
c)3 Na₂O + 2 H₃PO₄→ 2 Na₃PO₄ + 3 H₂O
3 Na₂O° + 6 H⁺ + 2 PO₄³⁻→6 Na⁺ + 2 PO₄³⁻ + 3 H₂O
3 Na₂O° + 6 H⁺ →6 Na⁺ + 3 H₂O
d)BaCl₂ + CuSO₄→ BaSO₄ + CuCl₂
Ba²⁺ + 2 Cl⁻ + Cu²⁺ + SO₄²⁻→ BaSO₄ + Cu²⁺ + 2 Cl⁻
Ba²⁺ + SO₄²⁻→ BaSO₄