Cobalt Chloride is considered toxic.
Chemicals and Solutions
- Solid CoCl₂*6H₂O
- Absolute Ethanol
- Small crystalizing dish
- Add a few crystals of CoCl₂*6H₂O to crystalizing dish on the overhead projector.
- Add about 25 ml of ethanol. This gives a deep blue color.
- Add water drop-wise showing the change from deep blue to pink.
An alternate version uses concentrated HCl in lieu of ethanol.