Hypoiodous acid is a chemical compound. It is also an acid. Its chemical formula is HIO. It has hydrogen and hypoiodite ions in it.

Hypoiodous acid is very unstable. It easily disproportionates to iodine and iodic acid. It is a disinfectant and oxidizing agent.

It is made by reacting mercury(II) oxide with iodine.

It is too unstable to be used, although people think that this is what makes iodine a disinfectant.

• Iodic acid
• Periodic acid

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