Question

The results of displacement reactions are as follows:

(i) Rough notes: $KCl$ solution with bromine or iodine solutions - no change to colourless solution - hexane not added.

(ii) $KBr$ solution with iodine solution - no change to colourless solution -hexane not added.

(iii) $KBr$ solution with chlorine solution - solution colourless to brown - brown colour moves to upper layer at the end.

(iv) $KI$ solution with chlorine or bromine water - solution colourless to brown in both cases - purple colour in upper hexane layer at the end ( brown colour of the aqueous layer reduced)

Take these recorded observations and draw up a table of the results. If there is no change, then write 'no reaction'.

Accepted Answer

The recorded results are given, the table of those results is as follows:

Halogens Bromine solution Iodine solution Chlorine solution

$KCl$ No reaction No reaction No reaction

$KBr$ No reaction No reaction ${Cl}_{2} + 2 Br \to 2 {Cl}^{-} + {Br}_{2}$

$KI$ ${Br}_{2} + 2 I^{-} \to 2 {Br}^{-} + I_{2}$ No reaction ${Cl}_{2} + 2 I^{-} \to 2 {Cl}^{-} + I_{2}$

When chlorine (as a gas or dissolved in water) is added to sodium bromide solution, chlorine takes the place of bromine. Because chlorine is more reactive than bromine, it displaces bromine from sodium bromide

Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 4: Exercise 4.4

Richard Harwood Chemistry Solutions for Exercise - Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 4: Exercise 4.4

Questions from Richard Harwood and Ian Lodge Solutions for Chapter: Chemical Reactions, Exercise 4: Exercise 4.4 with Hints & Solutions

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