Packaging: 300kg*80drums, 24ton/FCL(With or without pallets); Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide (HBr) in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 �°C (255.7 �°F) and contains 47.6% HBr by mass, which is 8.77 mol/L. Hydrobromic acid has a pKa of â??9, making it a stronger acid than hydrochloric acid, but not as strong as hydroiodic acid.Hydrobromic acid is one of the strongest mineral acids known.