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The mechanism for the reaction of hydrogen iodide with sulfuric acid begins with the protonation of hydrogen iodide, resulting in the formation of a hydrogen cation (H+) and an iodide ion (I-). The hydrogen cation can then react with sulfuric acid to generate a hydronium ion (H3O+) and a hydrogen sulfate ion (HSO4-). The iodide ion can then react with the hydrogen sulfate ion to form water (H2O) and iodine (I2).