Hypobromous acid is a chemical compound. It is also an acid. Its chemical formula is HBrO. It contains hydrogen and hypobromite ions. It is a weak and unstable acid. It is similar to hypochlorous acid. It disproportionates into bromate and bromide when heated or left to dry. It is made when bromine is added to warm water. It can kill many bacteria and deodorize. It works very well when it is with hypochlorous acid.