(i) Place a crystal of potassium dichromate, potassium dichromate (VI), or ammonium
dichromate at the bottom of a beaker of water. To do this, put a glass tube into the beaker
of water so that it touches the bottom, then to drop the crystal down the tube. Close the
top of the tube with your finger and remove the tube gently, leaving the crystal in the
beaker. The colour of the dissolving crystal will spread throughout the water in quite a
short time.
(ii) Fill a very small open bottle with a strong solution of potassium permanganate, potassium
manganate (VII). Place this in a larger jar. Fill the larger jar very carefully by pouring water
down the side until the water level is above the top of the small bottle. Leave this for a few
days. The potassium permanganate solution diffuses evenly through the water.
sharon kalunda answered the question on April 12, 2019 at 08:05
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