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Halogen Displacement Reactions

Halogen displacement reactions are redox reactions where the more reactive halogen displaces the less reactive halide from its salt in solution.Chlorine displaces bromide and iodide ions. Bromine displaces iodide ions.
Cl2(aq) + 2KBr(aq) → 2KCl (aq) + Br2(aq)Chlorine is a pale yellow-green gas and almost colourless in solution. Potassium bromide solution is colourless. When reacted bromine forms giving an orange solution.
Cl2(aq) + 2KI(aq) → 2KCl(aq) + I2(aq)The solution turns from colourless to brown.
Br2(aq) + 2KI(aq) → 2KBr(aq) + I2(aq)Bromine dissolved in water gives an orange solution. The solution turns from orange to brown.

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 4B: The elements of Group 7 (halogens). Topic: Types of Reaction.

Key terms in this lesson

redox reaction
A reaction in which oxidation and reduction happen together, with electrons transferred between the species involved.

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