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Sulphuric acid is an oxidising agent while sulphurous acid is a reducing agent. What could be a common test to distinguish between the two?
Since I would need a common reactant to react with with sulphurous acid as well as sulphuric acid, the reactant should be capable of getting, both, oxidised as well as reduced.
Would it be correct to say that sulphurous acid will react with ferric chloride to give ferrous chloride but there would be no reaction between sulphuric acid and ferric chloride.
Carefully boil away part of the solution in a fume hood. For Sulfurous acid: H2SO3 <--> H2O + SO2 (g)Distinct smell of SO2 and the solution's pH should increase (less acidic). H2SO4 is more stable, should not observe a rise in pH.
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