Fuming sulfuric acid

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Fuming sulfuric acid, also called oleum, is produced by adding sulfur trioxide, SO3, to sulfuric acid. It mostly contains disulfuric acid (also called pyrosulfuric acid).

SO3 + H2SO4 → H2S2O7

Additional sulfur trioxide molecules can be added to create trisulfuric acid (H2S3O10), tetrasulfuric acid (H2S4O13) and so on up to very long sulfur trioxide polymers, H(SO3)nH.

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