Hydroiodic acid (or hydriodic acid ) is a highly acidic aqueous solution of hydrogen iodide ( H I )
(concentrated solution usually 48 - 57% HI). It is the second strongest hydrohalic acid , after hydroastatic acid . Hydroiodic acid is a commonly used chemical reagent and is one of the strong acids that ionize completely in an aqueous solution. Concentrated hydroiodic acid has a pH of less than 0. [ citation needed ]
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