Which of the following is the correct name for the acid with the formula HF?

• A. Fluoric acid
• B. Fluorine acid
• C. Hydrofluoric acid
• D. Hydrogen fluoride acid

Answer: (C)

Verified step by step guidance

1. Identify the chemical formula given: HF.
2. Recognize that HF is a binary acid composed of hydrogen and a halogen (fluorine).
3. Recall the naming convention for binary acids: use the prefix 'hydro-', then the root of the halogen name, and end with the suffix '-ic acid'.
4. Apply this rule to HF: the halogen is fluorine, so the root is 'fluor-', and adding the suffix '-ic acid' gives 'hydrofluoric acid'.
5. Confirm that 'hydrofluoric acid' is the correct systematic name for HF, rather than other options like 'fluoric acid' or 'fluorine acid'.