1.NaOH+HCL=NaCL+H2O
2.CuSO4+2NaOH=Na2SO4+Cu(OH)2↓
3.Zn+H2SO4=ZnSO4+H2↑
4.CO2+2NaOH=Na2CO3+H2O
5.2HCL+CaCO3=CaCL2+H2O+CO2↑