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Periodic Acid
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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