Displacement reactions as redox reactions
3 marks · EasyFluorine can react with potassium chloride solution in a displacement reaction.
State whether potassium chloride reacts with bromine water. Explain your answer.
Explain why fluorine always acts as an oxidising agent in these types of reactions.
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(a) No, potassium chloride does not react with bromine water because bromine is less reactive than chlorine and cannot displace chloride ions. · must show no reaction, bromine less reactive than chlorine, cannot displace chloride ions
(b) Fluorine is the most reactive halogen so it gains electrons and is reduced, oxidising other halide ions. · must show fluorine gains electrons, causes oxidation of others
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Marking points
B1 (a) · 1 mark · States that no reaction occurs / chloride is not displaced.
B2 (a) · 1 mark · Explains that bromine is less reactive than chlorine and cannot displace chloride ions.
B3 (b) · 1 mark · Explains that fluorine acts as an oxidising agent because it gains electrons and causes oxidation of other halide ions.
Worked solution
a) Potassium chloride does not react with bromine water because bromine is less reactive than chlorine and cannot displace chloride ions from solution.
b) Fluorine always acts as an oxidising agent because it is very reactive and readily accepts electrons from other halide ions (is reduced), causing their oxidation.