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It combines directly with bromine, and, with fuming hydrobromic acid at 100� C., it gives chiefly α-brombutyric acid.

It forms addition products with bromine and hydrobromic acid.

Being an unsaturated acid it combines directly with hydrochloric acid, hydrobromic acid, bromine, &c.

Barium bromide is prepared by saturating baryta-water or by decomposing barium carbonate with hydrobromic acid.

It can be prepared in exactly the same way as hydrobromic acid, iodine being substituted for bromine.