1)Zn(OH)₂+2HCl=ZnCl₂+2H₂O
Zn(OH)₂+2H⁺+2Cl⁻=Zn²⁺+2Cl⁻+2H₂O
Zn(OH)₂+2H⁺=Zn²⁺+2H₂O
2)Zn(NO₃)₂+2NaOH=2NaNO₃+Zn(OH)₂
Zn²⁺+2NO₃⁻+2Na⁺+2OH⁻=2Na⁺+2NO₃⁻+Zn(OH)₂
Zn²⁺+2OH⁻=Zn(OH)₂
3)CaCO₃+2HCl=CaCl₂+H₂O+CO₂
CaCO₃+2H⁺+2Cl⁻=Ca²⁺+2Cl⁻+H₂O+CO₂
CaCO₃+2H⁺=Ca²⁺+H₂O+CO₂