Cu(NO₃)₂ + 2NaOH = Cu(OH)₂ + 2NaNO₃Cu²⁺+2NO₃⁻+2Na⁺+2OH⁻ = Cu(OH)₂ + 2Na⁺+2NO₃⁻Cu²⁺+2OH⁻ = Cu(OH)₂Cu(NO₃)₂ + Fe = Cu + Fe(NO₃)₂Cu²⁺+2NO₃⁻ + Fe = Cu + Fe²⁺+2NO₃⁻Cu²⁺+ Fe = Fe²⁺ + CuNaOH + HCl = NaCl + H₂ONa⁺+OH⁻+H⁺+Cl⁻ = Na⁺+Cl⁻ + H₂OH⁺+OH⁻ = H₂O2NaOH + SO₃ = Na₂SO₄ + H₂O2Na⁺+ 2OH⁻ + SO₃ = 2Na⁺+SO₄²⁻+H₂O2OH⁻+SO₃ = SO₄²⁻ + H₂OCaCO₃ + 2HCl = CaCl₂ + H₂O + CO₂CaCO₃ + 2H⁺+2Cl⁻ = Ca²⁺ + 2Cl⁻ + H₂O + CO₂CaCO₃ + 2H⁺ = Ca²⁺ + H₂O + CO₂CaO + 2HCl = CaCl₂ + H₂OCaO + 2H⁺+2Cl⁻ = Ca²⁺+2Cl⁻+H₂OCaO + 2H⁺ = Ca²⁺+H₂O