1)CuSO₄+Ba(NO₃)₂=Cu(NO₃)₂+BaSO₄↓
Cu²⁺+SO₄²⁻+Ba²⁺+2NO₃⁻=Cu²⁺+2NO₃⁻+BaSO₄↓
Ba²⁺+SO₄²⁻=BaSO₄↓
2)3KOH + H₃PO₄ = K₃PO₄ + 3H₂O
3K⁺ + 3OH⁻ + H₃PO₄ = 3K⁺ + PO₄³⁻ + 3H2O
3OH⁻ + H₃PO₄ = 3H2O + PO₄³⁻
3)Na₂CO₃ + 2HCl = 2NaCl + CO₂ + H₂O
2Na⁺ + CO₃²⁻ + 2H⁺ + 2Cl⁻ = 2Na⁺ + 2Cl⁻ + CO₂ + H₂O
2H⁺ + CO₃²⁻ = CO₂ + H₂O
4)FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
Fe(2+) +SO4(2-)+2Na(+)+2OH(-)=Fe(OH)2+2Na(+)+SO4(2-)
Fe(2+) +2OH(-)=Fe(OH)2
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Answers & Comments
1)CuSO₄+Ba(NO₃)₂=Cu(NO₃)₂+BaSO₄↓
Cu²⁺+SO₄²⁻+Ba²⁺+2NO₃⁻=Cu²⁺+2NO₃⁻+BaSO₄↓
Ba²⁺+SO₄²⁻=BaSO₄↓
2)3KOH + H₃PO₄ = K₃PO₄ + 3H₂O
3K⁺ + 3OH⁻ + H₃PO₄ = 3K⁺ + PO₄³⁻ + 3H2O
3OH⁻ + H₃PO₄ = 3H2O + PO₄³⁻
3)Na₂CO₃ + 2HCl = 2NaCl + CO₂ + H₂O
2Na⁺ + CO₃²⁻ + 2H⁺ + 2Cl⁻ = 2Na⁺ + 2Cl⁻ + CO₂ + H₂O
2H⁺ + CO₃²⁻ = CO₂ + H₂O
4)FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
Fe(2+) +SO4(2-)+2Na(+)+2OH(-)=Fe(OH)2+2Na(+)+SO4(2-)
Fe(2+) +2OH(-)=Fe(OH)2