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The chemical difference is the oxidation state of sulfur, but only this makes a great difference in the allover chemical properties:

  • H2SO3, sulfurous acid, oxidation state +4, weak diprotic acid, only stable in water, without it will decompose into sulfurous oxide (gas, SO2)
  • H2SO4, sulfuric acid, oxidation state +6, strong (second protolysis is relatively strong) diprotic acid, hygroscopical with and very stable in water.
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13y ago
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Q: What is difference between H2SO3 and H2SO4?
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