1)
2HNO₃ + Ba(OH)₂ = Ba(NO₃)₂ + 2H₂O
2H⁺ + 2NO₃⁻ + Ba²⁺ + 2OH⁻ = Ba²⁺ + 2NO₃⁻ + 2H₂O
2H⁺ + 2OH⁻ = 2H₂O
2)
Ba(NO₂)₂
+ K₂SO₄ = 2KNO₃ + BaSO₄↓
Ba²⁺ + 2NO₂⁻ + 2K⁺ + SO₄²⁻ = 2K⁺+ 2NO₃⁻ + BaSO₄↓
Ba²⁺ + SO₄²⁻ = BaSO₄↓
3)
K₂CO₃
+ 2HCI = 2KCI + CO₂↑+H₂O
2K⁺ + CO₃²⁻ + 2H⁺ + 2CI ⁻= 2K⁺ + 2CI⁻ + CO₂↑+H₂O
CO₃²⁻ + 2H⁺ = CO₂↑+H₂O