1) H2S+Cd(NO3)2=CdS+2HNO3
2H⁻+S⁻²+Cd⁺²+2NO₃⁺¹=CdS⁻+2H⁺+2NO₃⁻
S⁻²+CD⁺²=CdS⁻
2)H2CO3+BaCl2=2HCL+BaCO₃
2H⁺+CO₃⁻²+Ba²+2Cl⁻=2H⁺+2Cl⁻+BaCO₃⁻
Ba⁺²+CO₃⁻²=BaCO⁻
3)Al2(SO4)3+6NH4OH=3(NH4)2SO4+2Al(OH)3
2Al⁺³+3SO₄⁻²+6NH₄⁺+6OH⁻=6NH⁺+3SO₄⁻²+2Al(OH)₃
2Al⁻³+6OH⁺=2Al(OH)₃⁻
4)3Ba(NO3)2+2H3PO4=BaPO₄+6HNO₃
3Ba⁺²+6NO₃⁻+6H⁺+2PO₄⁻³=BaPO₄⁻+6H⁺+NO₃⁻²
3Ba⁺²+2PO₄⁻³=BaPO₄⁻
5)H2SO4+Ba(OH)2=BaSO₄+2H₂O
2H⁺+SO₂⁻²+Ba⁺²+2OH⁻=Ba⁺²+SO₄⁻²+H₂O⁻
H⁺+OH⁻=H₂O⁻
6)Pb(CH3COO)2+2NaCl=PbCl₂+2NaCH3COO
Pb⁺²+2CH3COO⁻+2Na⁺+2Cl⁻=PbCl⁻+2Na+2CH3COO⁻
Pb²+2Cl⁻=PbCl⁻