Registration Dossier

Diss Factsheets

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

In water, bromine rapidly hydrolyses to form hypobromous acid (HOBr):
Br2 + H2O → HOBr + H+ + Br-  (hydrolysis constant 5.8 x 10-9 at 25 ºC).
In pure aqueous solutions, the species present are molecular bromine (Br2), hypobromous acid (HOBr), and the hypobromite ion (OBr-) resulting from the dissociation of hypobromous acid. 
HOBr = OBr- + H+

Key value for chemical safety assessment

Additional information