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Question
How is SO2 prepared in the laboratory from sodium sulfite?
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Solution
In laboratory, sulfur dioxide is prepared by treating sodium sulfite with dilute sulfuric acid.
\[\ce{\underset{\text{Sodium sulfite}}{Na2SO_{3(aq)}} + \underset{\text{Sulfuric acid (dil)}}{H2SO_{4(aq)}} -> \underset{\text{Sulfur dioxide}}{SO_{2(g)}} + \underset{\text{Sodium sulfate}}{Na2SO4_{(aq)}} + H2O_{(l)}}\]
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