Floating bubbles!



MATERIALS :

1. Half cup of baking soda
2. One cup of vinegar
3. Three big transparent containers which are taller than they are deep. (Glass bowls can be used in this case but glass vases are even better.)
4. Bubble making wand and bubble making liquid which is normally soap water.

INSTRUCTIONS :

1. At first put half of the baking soda from the cup into one transparent container and half of the vinegar from the cup into another transparent container.
2. Now combine the remaining baking soda and remaining vinegar in the third transparent container.
3. Observe and record what happens in the container when baking soda and vinegar is combined.
4. Now blow some bubbles into each of the transparent containers using the bubble making wand and bubble making liquid.
5. Observe and record where the bubbles settles.

RESULT :

1. The bubbles created by using the bubble making wand and bubble making liquid should float to the bottom of the transparent containers that have baking soda in it.
2. The bubbles created by using the bubble making wand and bubble making liquid should float to the bottom of the transparent containers that have vinegar in it.
3. The bubbles created by using a bubble making wand and bubble making liquid should float on an invisible layer of gas over the transparent container that have the combination of baking soda and vinegar in it.

EXPLANATION :

When bubble is blown by using a bubble making wand and bubble making liquid or soap water a pretty amount of carbon dioxide which is exhaled by the blower gets trapped inside the bubble. Carbon dioxide is denser than the air. In the transparent containers containing either baking soda or vinegar in them, the blown bubbles float to the bottom because of the carbon dioxide inside the bubbles. But when baking soda and vinegar is combined a chemical reaction occurs, which produces carbon dioxide gas as a by-product. So a layer of carbon dioxide gas is produced inside the transparent container at the bottom. The gas inside the bubble is actually a mixer of carbon dioxide gas and various other kinds of gases. So it is less dense than the pure carbon dioxide. The layer of carbon dioxide which is created inside the transparent container at the bottom is pure carbon dioxide gas. So the gas inside the bubble is less dense than the carbon dioxide layer at the bottom of the transparent container. That’s why the blown bubbles float on top of the invisible layer of carbon dioxide.

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