Chemical Test For Bromine 2:

2) Displacement reactions : Bromine can also displace  iodide ions from  a metal iodide compounds.

     Bromine  liquid  is added to the solution of Iodide ions:

Notes

·         Aqueous iodine i.e formed here is insoluble in water but soluble in KI Solution forming I3- Ions. ·         To Identify the spectator ions,  we                  need to consider some facts: 1) State Symbols 2) Oxidation no. of components in             a redox reaction.

Br₂ (l)  +    2KI  (aq)  →  2KBr (aq)  +     I₂ (aq)              

                                                   

Ionically,

Br₂ (l) +  I ^- (aq)      →   2Br^- (aq) +    I₂ (aq)

At the end of the reaction , if the product mixture is shaken with CCl₄ / Hexane/ Cyclohexane /, Two coloured layers are observed. 

 Iodine is less soluble in water but more soluble in CCl₄ or hexane or cyclohexane since iodine is non-polar .