S→ so2→ na2so3→ so2

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This chemical reaction involves the conversion of sulfur dioxide (SO2) into sodium sulfite (Na2SO3) and back into sulfur dioxide (SO2). The overall reaction can be represented as:

2 Na2SO3 (s) + 2 HCl (aq) → 2 NaCl (aq) + SO2 (g) + H2O (l)

In this reaction, sodium sulfite reacts with hydrochloric acid to form sodium chloride, sulfur dioxide, and water. This demonstrates the reversible nature of the reaction between SO2 and Na2SO3.