(1)产生H2:Zn+2HCl=ZnCl2+H2↑
(2)产生CO2:CaCO3+2HCl=CaCl2+H2O+CO2↑
(3)除去CO2:2NaOH+CO2=Na2CO3+H2O
(4)除去HCl:NaOH+HCl=NaCl+H2O