Action of heat on cobalt II chloride

Instructions:

Part I

1. Place one spatula of cobalt II chloride in a dry test tube.
2. Heat gently at first and then strongly until no further change occurs.
3. Allow to cool and and add a few drops of water to the COOL residue.

Part II

1. Make up a strong solution of cobalt chloride by dissolving 3 spatulas of cobalt chloride in 5 cm3 of water.
2. Dip a piece of filter paper into the solution and dry it out over a hot gauze (too hot and it will char the filter paper)
3. Observe the change in the paper. Dip the paper into some water - observe again

Observations

• Before
• During
• After

colour, state and any other observations.

 

Appearance	Before	During	After
State
Colour
Other observations

Experimental write up: