2 Na+2H2O=2 NaOH+H2↑
2 NaOH + H2S = Na2S + 2 H2O
Na2S + 2 HCl(разб.) = 2NaCl + H2S↑
H2SO4 + 2 NaCl = Na2SO4+ 2HCl↑
Na2SO4+ BaCl2 = 2NaCl + BaSO4 ↓
2 Na+2H2O=2 NaOH+H2↑
2 NaOH + H2S = Na2S + 2 H2O
Na2S + 2 HCl(разб.) = 2NaCl + H2S↑
H2SO4 + 2 NaCl = Na2SO4+ 2HCl↑
Na2SO4+ BaCl2 = 2NaCl + BaSO4 ↓