Na-NaH-NaOH-NaHSO4-Na2SO4-NaOH
2Na+H2-->2NaH NaH+H2O-->NaOH+H2↑ NaOH+H2SO4-->NaHSO4+H2O NaHSO4+NaOH-->Na2SO4+H2O Na2SO4+Ba(OH)2-->BaSO4↓+2NaOH