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Periodic Acid
Periodic acid[1] is HIO4 or H5IO6.
In dilute solution, periodic acid exists as H+ and IO4-. When more concentrated, orthoperiodic acid, H5IO6, is formed. This can be obtained as a crystalline solid. Orthoperiodic acid can be dehydrated to metaperiodic acid, HIO4. Further heating gives diiodine pentoxide (I2O5) and oxygen; apparently the anhydride 'diiodine heptoxide' does not exist in nature but can be formed synthetically
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