3) CdO +
2HNO3 = Cd(NO₃)₂ + H₂
O
CdO + 2H⁺ + 2NO3⁻ = Cd²⁺ + 2NO₃⁻ + H₂O
CdO + 2H⁺ = Cd²⁺ + H₂O
Cd(NO₃)₂ + 2KOH = Cd(OH)₂
↓ + 2KNO₃
Cd²⁺ + 2NO₃⁻ + 2K⁺ + 2OH⁻ = Cd(OH)₂↓ + 2K⁺ + 2NO₃⁻
Cd²⁺ + 2OH⁻ = Cd(OH)₂↓
Cd(OH)₂ + 2HCl = CdCl₂ + 2H₂
O
Cd(OH)₂ + 2H⁺ + 2Cl⁻ = Cd⁺ + 2Cl⁻ + 2H₂O
Cd(OH)₂ + 2H⁺ = Cd⁺ + 2H₂O
CdCl₂ + Zn = ZnCl₂ + Cd
Cd²⁺ + 2Cl⁻ + Zn = Zn²⁺ + 2Cl⁻ + Cd
Cd²⁺ + Zn = Zn²⁺ + Cd