Question detail
Predict the outcome of a displacement reaction between chlorine (Cl2) and potassium bromide (KBr). Write the balanced ionic equation for the reaction.
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Question
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Topic
Group 7(17), the halogens
Question
Predict the outcome of a displacement reaction between chlorine (Cl2) and potassium bromide (KBr). Write the balanced ionic equation for the reaction.
Answer
Chlorine displaces bromine in potassium bromide, forming potassium chloride (KCl) and bromine (Br2). The balanced ionic equation is: Cl2 + 2KBr → 2KCl + Br2.
Explanation
This question tests the understanding of halogen displacement reactions and requires knowledge of the reactivity series. Chlorine is more reactive than bromine, allowing it to displace bromine from its compound. The balanced equation demonstrates the conservation of mass and charge.
Common mistake
Misunderstanding Displacement Reactions
Students often confuse the reactivity of halogens and incorrectly predict that a less reactive halogen can displace a more reactive halogen from its compound.
To correctly predict halogen displacement reactions, remember that a more reactive halogen will displace a less reactive halogen. For example, in the reaction between chlorine and potassium bromide, chlorine (more reactive) displaces bromine (less reactive). Therefore, the correct prediction is that chlorine will displace bromine, forming potassium chloride and bromine gas.
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