What is the formula for hydrosulfic acid?

Did you mean hydrosulfuric acid? H2S is the formula for that!

An acid can be thought of as a molecule containing at least one hydrogen cation (H+) attached to an anion. The nomenclature of acids depends on whether the anion contains oxygen. If the anion does not contain oxygen, the acid is named with the prefix hydro- and the suffix -ic.

For example, HCl dissolved in water is called hydrochloric acid. Likewise, HCN and H2S dissolved in water are called hydrocyanic and hydrosulfuric acids, respectively.

If the anion of the acid contains oxygen, the name is formed by adding the suffix -ic or -ous to the root name of the anion. If the anion name ends in -ate, the -ate is replaced by -ic (or sometimes -ric).

See names of common acids and its formula at Britannica.

Tags: h2shydrogen sulfide