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Na→NaOH→Na2SO4→NaCL→NaNO3
↓
NaH→NaOH

2Na + 2H2O = 2NaOH + H2
2NaOH + H2SO4 = Na2SO4 + 2H2O
Na2SO4 + CaCl2 = 2NaCl + CaSO4
NaCl + HNO3 = NaNO3 + HCl

2Na + H2 = 2NaH
NaH + H2O = NaOH + H2