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Cobalt Equilibrium

Hazards

Cobalt Chloride is considered toxic.

Chemicals and Solutions

  • Solid CoCl*6HO
  • Absolute Ethanol

Materials

  • Water
  • Small crystalizing dish

Procedure

  1. Add a few crystals of CoCl*6HO to crystalizing dish on the overhead projector.
  2. Add about 25 ml of ethanol. This gives a deep blue color.
  3. Add water drop-wise showing the change from deep blue to pink.

An alternate version uses concentrated HCl in lieu of ethanol.

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