K₂CO₃+2HCl=2KCl+H₂O+CO₂
2K¹⁺+CO₃²⁻+2H¹⁺+2Cl¹⁻=2K¹⁺+2Cl¹⁻+H₂O+CO₂
CO₃²⁻+2H¹⁺=H₂O+CO₂
2)NaOH+HNO₃=NaNO₃+H₂O
Na¹⁺+OH¹⁻+H⁺+NO₃⁻=Na⁺+NO₃⁻+H₂O
OH⁻+H⁺=H₂O
3)Na₂SO₄+Ba(NO₃)₂=2NaNO₃+BaSO₄(осадок)
2Na⁺+SO₄²⁻+Ba²⁺+2NO₃⁻=2Na⁺+2NO₃⁻+BaSO₄
SO₄²⁻+Ba²=BaSO₄
4)CuSO₄+2KOH=K₂SO₄+Cu(OH)₂(осадок)
Cu²⁺+SO₄²⁻+2K⁺+2OH⁻=2K⁺+SO₄²⁻+Cu(OH)₂
Cu²⁺+2OH⁻=Cu(OH)₂