What is the correct name for the acid with the formula HI?

• A. hydroiodic acid
• B. hydroiodous acid
• C. iodous acid
• D. iodic acid

Answer: (A)

Verified step by step guidance

1. Identify the type of acid based on the formula HI. Since it is a binary acid composed of hydrogen and a halogen (iodine), it is named as a hydrohalic acid.
2. Recall the naming convention for binary acids: the prefix 'hydro-' is added, followed by the root of the halogen name, and the suffix '-ic' is used, ending with the word 'acid'.
3. Determine the root name of the halogen in HI, which is iodine. The root used in acid names is 'iod'.
4. Combine the prefix, root, and suffix to form the acid name: 'hydro' + 'iod' + 'ic' + 'acid'.
5. Conclude that the correct name for HI is 'hydroiodic acid'.