1)Ba(OH)₂+H₂SO₄=BaSO₄+2H₂O Ba²⁺+2OH⁻+2H⁺+SO₄²⁻=BaSO₄+2H₂O 3)СuSO₄+H₂S=CuS+H₂SO₄ Cu²⁺+SO₄²⁻+2H⁺+S²⁻=CuS+2H⁺+SO₄²⁻ Cu²⁺+S²⁻=CuS 4)BaCO₃+2HNO₃=Ba(NO₃)₂+H₂CO₃ Ba²⁺+CO₃²⁻+2H⁺+2NO₃⁻=Ba²⁺+2NO₃⁻+2H⁺+CO₃²⁻ 5)MgCO₃+HCL=MgCL₂+H₂CO₃ Mg²⁺+CO₃²⁻+H⁺+CL⁻=Mg²⁺+2CL⁻+2H⁺+CO₃²⁻