Displacement of halogens

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Presentation transcript:

Displacement of halogens If a halogen is added to a solution of a compound containing a less reactive halogen, it will react with the compound and form a new one. This is called displacement. sodium chloride sodium fluoride chlorine fluorine +  F2 (aq) 2NaCl (aq) 2NaF (aq) Cl2 (aq) A more reactive halogen will always displace a less reactive halide from its compounds in solution.

Halogen Displacement

Halogen Displacement Q) Write an equation to show the reactions which are taking place in tubes 1,2 and 4 KBr added KI added KI added Bromine water KCl added Chlorine water Iodine water KBr added KCl added Colour change Yes Yes No Yes No No

Displacement Equations Potassium Bromide and Chlorine: 2KBr + Cl2  2KCl + Br2 Potassium Iodide and Chlorine: 2KI + Cl2  2KCl + I2 Potassium Iodide and Bromine: 2KI + Br2  2KBr + I2

Displacement reactions: summary The reactions between solutions of halogens and metal halides (salts) can be summarised in a table: 2KCl + I2 2KBr + I2 halogen chlorine bromine iodine salt (aq) potassium chloride potassium iodide potassium bromide 2KCl + Br2 no reaction