Chemical Reactions
SO3 is the anhydride of H2SO4. Thus, the following reaction occurs:
- SO3 (g) + H2O (l) → H2SO4 (aq) (−88 kJ mol−1)
The reaction occurs both rapidly and exothermically, too violently to be used in large-scale manufacturing. At or above 340 °C, sulfuric acid, sulfur trioxide, and water coexist in significant equilibrium concentrations.
Sulfur trioxide also reacts with sulfur dichloride to yield the useful reagent, thionyl chloride.
- SO3 + SCl2 → SOCl2 + SO2
SO3 is a strong Lewis acid readily forming crystalline complexes with pyridine, dioxane and trimethylamine which can be used as sulfonating agents.
Read more about this topic: Sulfur Trioxide
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