Displacement reactions involving the halogens

2 marks · Normal

Write the balanced equation for the reaction between chlorine and potassium bromide. State the colour change seen during the reaction.

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2KBr(aq) + Cl2(aq) -> 2KCl(aq) + Br2(aq); solution turns orange

Also accept: Orange-brown colour; Equation using correct formulas only

Common mistakes: Incorrectly writing Br2 as the reactant; Wrong colour

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Marking points

B1 · 1 mark · Correct equation: 2KBr(aq) + Cl2(aq) -> 2KCl(aq) + Br2(aq)

B2 · 1 mark · Colour change: orange or orange-brown solution.

Worked solution

The solution turns orange as bromine is formed.