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Physical & Chemical properties

Dissociation constant

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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+

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