Here's why:
* Binary acids are acids formed from hydrogen and a non-metal. These acids have the general formula "HX", where X is the non-metal.
* When the non-metal is combined with hydrogen, it forms an anion that ends in "-ide". For example, chlorine (Cl) forms chloride (Cl-), bromine (Br) forms bromide (Br-), etc.
* When naming these acids, the prefix "hydro" is used followed by the name of the non-metal with the suffix "-ic acid".
Examples:
* HCl: Hydrochloric acid (chloride anion)
* HBr: Hydrobromic acid (bromide anion)
* HI: Hydroiodic acid (iodide anion)
* H₂S: Hydrosulfuric acid (sulfide anion)
Important Note: This rule only applies to binary acids. For ternary acids (acids containing three elements), different naming conventions are used.
