1) 2Na + 2H2O -> 2NaOH + H2
2Na[0] + 2H2O -> 2Na[+1] + 2OH[-1] + H2[0]
2) NaOH + HCl -> NaCl + H2O
Na[+1] + OH[-1] + H[+1] + Cl[-1] -> Na[+1] + Cl[-1] + H2O
H[+1] + OH[-1] -> H2O
3) 2NaCl + 2H2O -(электролиз)-> 2NaOH + H2 + Cl2
4) 4NaOH(расплав) → (электролиз)-> 4Na + 2H2O + O2