Diffusion of copper sulfate crystals in water
Apparatus and materials
Copper sulfate crystals (harmful)
Health & Safety & Technical notes
Warn students who might try to taste copper sulfate that it is harmful if swallowed.
Put a layer of large copper sulfate crystals in a gas jar of water with a cover glass over the top.
a Show the newly-filled gas jar.
b Leave undisturbed for several weeks.
c Get the class to check the gas jar each week.
After several weeks, the blue of the copper sulfate will diffuse into the water. Obviously, it is helpful if the jar is not moved or knocked.
This experiment was safety-checked in February 2006