pink in aqueous solution and
is blue. The equilibrium between these two species can be disturbed
ions and by changing the temperature. The changes in the equilibrium
position are as predicted by Le Chatelier's principle.
Six boiling tubes and a rack.
Two dropping pipettes
Access to a top pan balance.
The quantities given are for one demonstration.
4g cobalt(II) chloride-6-water -
concentrated hydrochloric acid.
of crushed ice.
Before the Demonstration
Boil a beaker of water and prepare a beaker of crushed ice and water.
Dissolve about 4g of cobalt(II) chloride-6-water in 40cm
of water. A pink solution containing
will be formed.