|MadSci Network: Chemistry|
The tempera paint contains chalk. The chalk is used as a filler to make the paint thicker. Chalk is composed of limestone, which is actually a chemical called calcium carbonate. The Kool-Aid contains citric acid, which gives it the lemon flavor. This acid reacted with the chalk and formed carbon dioxide gas. Carbon dioxide, or CO2 is what gives soda its fizz. It is the same thing that happens when you mix vinegar with baking soda. If you mix chalk powder with vinegar, then it wll also fizz. Try mixing other flavors of Kool-Aid with the tempera paint. Some color like cherry, might not fizz. The white rubbery stuff was probably egg-white which was cooked by the acid in the Kool-Aid. Egg-white is used to amke tempera paint. Certain chemicals can cook egg-white without heat. Try adding soime egg white to the Kool-Aid instead of paint. I haven't tried this myself, but it might work. You might also try egg-white with vinegar, but I haven't tried that either. Try painting with that foaming mess, maybe it will give an interesting texture. Have fun
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