Bromine reacts with water in a disproportionation reaction, meaning that the bromine atoms undergo both oxidation and reduction. This results in the formation of bromine acid (HBr) and hypobromous acid (HOBr):

Br₂ (l) + H₂O (l) ⇌ HBr (aq) + HOBr (aq)

Here's a breakdown of what happens:

* Oxidation: One bromine atom gains an electron to form bromide ion (Br-) in HBr. This is a reduction.

* Reduction: The other bromine atom loses an electron to form hypobromite ion (OBr-) in HOBr. This is an oxidation.

Important points:

* The reaction is reversible, meaning that the equilibrium can shift depending on the conditions.

* HOBr is a weak acid and a powerful oxidizing agent. It is responsible for the bleaching and disinfecting properties of bromine water.

* The reaction is favored by the presence of excess water.

* The color of bromine water changes from orange-brown to pale yellow due to the formation of HOBr.

Applications:

This reaction is important in various applications, including:

* Disinfection: Bromine water is used as a disinfectant in pools and spas.

* Bleaching: HOBr is a powerful bleaching agent.

* Organic synthesis: HOBr is used as a reagent in various organic reactions.

Overall, the reaction between bromine and water is a complex but important process that leads to the formation of several valuable chemical species.