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Replacement Reactions of Halogens

Hazards

  • Methylene chloride is toxic.
  • Chlorine water and bromine water are corrosive and toxic.

Chemicals and Solutions

  • 0.1M KCl
  • 0.1M KBr
  • 0.1M KI
  • Chlorine water
  • Bromine water
  • Iodine water
  • Methylene chloride

Materials

  • Three ringstands
  • Six 250 mL separatory funnels with stoppers
  • Six rings

Procedure

Perform the following reactions in the separatory funnels, and extract each reaction mixture with methylene chloride in order to see the characteristic color of the halogen.

\( \ce{ Cl2_{(g)} + 2Br-_{(aq)} -> Br2_{(g)} + 2Cl- } \)

\( \ce{ Cl2_{(g)} + 2I-_{(aq)} -> I2_{(g)} + 2Cl- } \)

\( \ce{ Br2_{(g)} + 2I-_{(aq)} -> I2_{(g)} + 2Br- } \)

\( \ce{ Br2_{(g)} + 2Cl-_{(aq)} -> no reaction } \)

\( \ce{ I2_{(g)} + 2Br-_{(aq)} -> no reaction } \)

\( \ce{ I2_{(g)} + 2Cl-_{(aq)} -> no reaction } \)

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