S -> SO2 -> H2SO3 -> Na2SO3
1. S + O2 = SO2
2. SO2 + H2O = H2SO3
3. 2H2SO3 + 2NaOH = Na2SO3 + 2H2O
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S -> SO2 -> H2SO3 -> Na2SO3
1. S + O2 = SO2
2. SO2 + H2O = H2SO3
3. 2H2SO3 + 2NaOH = Na2SO3 + 2H2O