1)
BaCl₂ + 2AgNO₃ = 2AgCl↓ + Ba(NO₃)₂
Ba²⁺ + 2Cl⁻ + 2Ag⁺ + 2NO₃⁻ = 2AgCl↓ + Ba²⁺ + 2NO₃⁻
2Ag⁺ + 2Cl⁻ = 2AgCl↓
2HNO₃ + Na₂CO₃ = 2NaNO₃ + H₂O + CO₂↑
2H⁺ + 2NO₃⁻ + 2Na⁺ + CO₃²⁻ = 2Na⁺ + 2NO₃⁻ + H₂O + CO₂↑
2H⁺ + CO₃²⁻ = H₂O + CO₂↑
2)
H⁺ + OH⁻ =H₂O
H⁺ + Cl⁻ + K⁺ + OH⁻ = K⁺ + Cl⁻ + H₂O
HCl + KOH = KCl + H₂O
Cu²⁺ + 2OH⁻ = Cu(OH)₂↓
Cu²⁺ + 2Cl⁻ + 2Na⁺ + 2OH⁻ = Cu(OH)₂↓ + 2Na⁺ + 2Cl⁻
CuCl₂ + 2NaOH = Cu(OH)₂ ↓ + 2NaCl