1. 4Na + O2 -> 2Na2O
2. Na2O + H2O -> 2NaOH
3. NaOH + HCl -> NaCl + H2O
4. Na2O + 2HCl -> 2NaCl + H2O
5. 2Na + H2SO4 -> Na2SO4 + H2
6. Na2O + H2SO4 -> Na2SO4 + H2O