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What is the Arrhenius acid that contains the bromite anion?
This acid would be called bromous acid and has the formula ##HBrO_2##
The bromite ion (##BrO_2##) has a -1 charge, so it must be paired with one hydrogen ion (##H^+##)
Acid names of ternary acids (contain such as bromite) will not include the prefix hydro. They will have a name ending which indicates which polyatomic ion they contain. Acids which contain polyatomic ions which end in "ite" will have names that end in "ous" and the "ic" ending is used for acids that contain polyatomic ions whose names end with the "ate" suffix.
Here is a video to provide additional information about acid nomenclature: