Hydriodic Acid, HI, the colorless or pale yellow aqueous solution of hydrogen iodide, also known as hydrogen iodide.

Hydriodic Acid is most commonly used as a catalyst or reducing agent in chemical reactions.

Due to its high level of acidity which allows it to kill several types of germs and viruses, hydriodic acid is often used to disinfect and sanitize medical tools and products.

In pharmaceutical applications, hydriodic acid is used as an intermediate to manufacture various medicines. Pharmaceutical intermediates are chemicals added to a chemical mixture to make it react and turn into another compound.