S + O2 = SO2
3SO2 + 2Na2S = 2Na2S2O3 + S
Na2S2O3 + H2SO4 = SO2 + S + Na2SO4 + H2O
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S + O2 = SO2
3SO2 + 2Na2S = 2Na2S2O3 + S
Na2S2O3 + H2SO4 = SO2 + S + Na2SO4 + H2O