Na2S+2HCl=H2S+2NaCl
2Na+S+2H+2Cl=H2S+2Na+2Cl
2H+S=H2S
K2CO3+2HCl=CO2+H2O+2KCl
2K+CO3+2H+2Cl=2K+2Cl+CO2+H2O
CO3+2H=CO2+H2O
NH4CL+KOH=NH3+H2O+KCl
NH4+Cl+K+OH=NH3+H2O+K+Cl
NH4+OH=NH3+H2O
Na2SO3+2HCl=2NaCl+SO2+H2O
2Na+SO3+2H+2Cl=2Na+2Cl+SO2+H2O
2H+SO3=SO2+H2O