1) H2S + O3 = SO2 + H2O (when hydrogen sulfide interacts with ozone, sulfur (IV) oxide and water are formed);
2) SO2 + 2NaOH = Na2SO3 + H2O (when sulfur (IV) oxide interacts with sodium hydroxide, sodium sulfite and water are formed);
3) Na2SO3 + CuSO4 = Na2SO4 + CuSO3 (when sodium sulfite interacts with copper sulfate, copper sulfite and sodium sulfate are formed).
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