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