2Na+2H2O=2NaOH+H2
2NaOH+H2S=Na2S+2H20
Na2S+2HCl=2NaCl+H2S
2NaCl+H2SO4=Na2SO4+2HCl
Na2SO4+BaCl2=BaSO4+2NaCl
вроде всё
2Na+2H2O=2NaOH+H2
2NaOH+H2S=Na2S+2H20
Na2S+2HCl=2NaCl+H2S
2NaCl+H2SO4=Na2SO4+2HCl
Na2SO4+BaCl2=BaSO4+2NaCl
вроде всё