Na->Na2O2->NaOH->Na2O->NaCl->Na
2 Na+O2 = Na2O2
2 Na2O2 + 2 H2O = 4 NaOH + O2
2 NaOH = Na2O+H2O
Na2O+2 HCl = 2 NaCl+H2O
2 NaCl = 2 Na+Cl2
