Equipment: A glass, mothballs, baking soda, vinegar, teaspoon.
Method: Fill the glass almost to the top with water. Add four teaspoons of baking soda and stir well until it is completely dissolved. Add four teaspoons of vinegar to the mixture and stir well. Carefully put four mothballs into the mixture and watch carefully.
Expected Result: You will see the mothballs moving up and down the glass.
Explanation: You will see bubbles of gas forming on the mothballs and this will make them float to the surface. Some of the bubbles will burst when they reach the top. Then you will see the mothballs sink slowly. The vinegar and baking soda when mixed together produce carbon dioxide. Bubbles of this gas stick to the rough surface of the mothballs and act as floats.
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