Na-NaOH-Na2S-NaCl-Na2SO4
2Na + 2H2O -> 2NaOH + H2
NaHS + NaOH(конц.) = Na2S + H2O
Na2S + 2HCl(разб.) = 2NaCl + H2S
NaCl + NaHSO4 = Na2SO4 + HCl
Na2SO4 + BaCl2 = BaSO4↓ + 2NaCl
Na-NaOH-Na2S-NaCl-Na2SO4
2Na + 2H2O -> 2NaOH + H2
NaHS + NaOH(конц.) = Na2S + H2O
Na2S + 2HCl(разб.) = 2NaCl + H2S
NaCl + NaHSO4 = Na2SO4 + HCl
Na2SO4 + BaCl2 = BaSO4↓ + 2NaCl