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Copper Equilibrium

Hazards

Conc. HCl is corrosive and toxic. Use care.

Chemicals and Solutions

  • 1 M CuSO solution
  • Concentrated HCl

Materials

  • 2 test tubes
  • Eyedropper
  • Distilled water

Procedure

  • Add some copper solution to one test tube.
  • Add some water to the solution - nothing happens except the solution gets more dilute.
  • Add some copper solution to the other test tube and add some concentrated HCl to the solution - it will turn green.
  • Add some water to the now green solution and it will turn blue again.

Discussion

\( \ce{ $\underset{\text{green}}{\ce{CuSO4 + 4Cl- -> [CuCl4]2- }}$ } \)

\( \ce{ $\underset{\text{blue}}{\ce{[CuCl4]2- + 6H2O -> [Cu(H2O)6]2+}}$ } \)

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