Final answer:
The name of HI(aq) is hydroiodic acid.
Step-by-step explanation:
An acid is an ionic compound of the H+ cation dissolved in water. The name of HI(aq) is hydroiodic acid. When naming an acid composed of hydrogen and one other element, the name is formed by adding the prefix hydro- to the stem of the other element and suffix -ic acid. Therefore, the correct answer is hydroiodic acid.