S → SO2 → H2SO3 → Na2SO3
1.S + O2 = SO2 (compound reaction, oxidation between non-metal and oxygen)
2.SO2 + H2O = H2SO3 (reversible compound reaction between water and acidic oxide)
3.H2SO3 + 2NaOH = Na2SO3 + 2H2O (neutralization reaction between acid and base)
Na → Na2O → NaOH
1.4Na + O2 = 2Na2O (compound reaction, oxidation between metal and oxygen)
2.Na2O + H2O = 2NaOH (a compound reaction between water and basic oxide)
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