Final answer:
The name hydroiodic acid is the correct name for HI according to the naming convention for binary acids, where "hydro-" is added to the stem of the nonmetal's name followed by "-ic acid".
Step-by-step explanation:
The proper name for HI is indeed hydroiodic acid. This follows the naming convention for binary acids, where the prefix "hydro-" is added to the name of the anion, and the last syllable is changed from "-ide" to "-ic acid". Therefore, just as HCl in aqueous solution is called hydrochloric acid, HI in aqueous solution is correctly called hydroiodic acid. This nomenclature applies when the compound acts as an acid, particularly when dissolved in water. It is worth noting that HI is a strong acid, as it dissociates 100% into ions in aqueous solution.