Materials:
Citric Acid Powder (obtained from drugstore)
Baking
Soda
Vegetable
oil
Plastic
spoon
Plastic
cup
Wax
paper
Markers
Procedure:
-
Add 1 spoonful Citric Acid powder
to cup.
-
Add 2 spoonfuls Baking Soda to
cup and stir to mix.
-
Add one spoonful Vegetable Oil
and stir till thoroughly mixed.
-
Mixture should be a thick paste- a
bit drier than toothpaste- not drippy or runny. Add a couple drops of oil
if too dry or a little baking soda if too wet.
-
Roll mixture into one or two small
balls and place on wax paper to dry for 24 to 48 hours.
-
After 24 – 48 hours, draw
a pupil, iris and red veins so it looks like a real eyeball.
Place the Fizzy Eyeball in a glass
of water and watch what happens. Tell observers the water is super strength hydrochloric
acid for a spooky science illusion!
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The Science:
Citric acid powder
is an acid and baking soda is a base. When the two are mixed with the vegetable
oil they don’t react because water is needed to start the reaction. When
the Fizzy Eyeball is placed in water the acid and base react in a fizzy chemical reaction.
Carbon dioxide and hydrogen bubbles are released.
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