When chlorine is added to a solution of bromide ions, a reaction takes place to form bromine and chloride ions. The reaction can be represented as follows:

Cl2 + 2Br- → 2Cl- + Br2

The bromine produced in the reaction is a reddish-brown gas with a pungent odor. It is also toxic and corrosive, so it is important to handle it with care.

The chloride ions produced in the reaction are colorless and odorless. They are also non-toxic and non-corrosive.

The overall effect of adding chlorine to a solution of bromide ions is to change the color of the solution from colorless to reddish-brown. The solution will also become more toxic and corrosive.