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QUESTION

# Write the correct chemical formula to distinguish between?: Hydrobromic acid and bromic acid

A good way to figure this out is that "hydro" implies that the anion does not have an oxygen atom, and that you can analogize with the chlorine-based acids that you were probably given.

For example:

"HCl": hydrochloric acid "HClO": hypochlorous acid "HClO"_2: chlorous acid "HClO"_3: chloric acid "HClO"_4: perchloric acid

None of the acids above that contain oxoanions (such as "ClO"_3^(-), or "ClO"_4^(-)) have "hydro" in their name.

Furthermore, the halogens all form acids with similar names because they are all in the same group/family. So, they have analogous acid naming schemes:

"HBr": hydrobromic acid "HCl": hydrochloric acid "HI": hydroiodic acid

From this, you should be able to figure out that you have:

"HBr": hydrobromic acid "HBrO"_3: bromic acid