Hydrobromic acid

This article relates to hydrogen bromide in solution. For information concerning the gas bromide of hydrogen, to see the article Bromide of hydrogen.

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The hydrobromic acid is an aqueous solution containing of the ions bromides and the ions hydroniums. The hydrobromic acid is formed by dissolution of Bromure of hydrogen HBr in water and can thus be used to prepare bromine salts: the Bromide S.

Acidity

The hydrobromic acid is a Strong acid , more extremely than the Hydrochloric acid but weaker than the Hydriodic acid as well as the Perchloric acid . It is completely dissociated in water. The HBr molecule dissociates (ionizes) to give a Ion H⁺ (a Proton). The other ion formed during dissociation is the Ion bromide Br^-. In aqueous Solution, the ion H⁺ binds to a water molecule to form an ion Hydronium H₃O⁺.

$HBr\; +\; H\_2O\; \backslash \; longrightarrow\; H\_3O^+\; +\; Br^-$

The pKa of the couple HBr (aq) /Br^- is worth -8.

Reactivity

The hydrobromic acid, under the action of a great number of Oxydant S is transformed into Dibrome and water. The ion bromide is a Réducteur and takes part in reactions of oxydoreduction. The attack of zinc in a hydrobromic acid solution is faster than that of lead, copper and the money.

Safety

See too

• Acid halohydric

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