Answer: As an acid is Hydrochloric Acid. As a binary compound is Hydrogen Chloride.
Step-by-step explanation: A binary acid is an acid that is formed of hydrogen and one other element, most commonly a halogen. To name it, begins with the prefix hydro- and then add the base name of the anion plus the suffix -ic and acid. For HCl, the anion is Cl⁻, so the name is HydroChloric Acid.
To name a binary compound:
- the order is cation first and then anion;
- use the name of cation with a fixed oxidation state directly from the periodic table;
- the name of anion is made from the name of the element plus the suffix -ide;
For HCl, the cation is H⁺ and from the periodic table is Hydrogen. Cl⁻ is chlor-, therefore as a binary compound the name is Hydrogen Chloride.