Fizz, fizz, zoom! This baking soda experiment boat is easy to build and fun to race. If you’ve ever dropped a fizzy tablet into a cup of water or made a baking soda volcano, you’ve made the same chemical reaction used here. But this time, we’re using that reaction to power a soda bottle boat, for a short distance at least.
This is one baking soda experiment that is more fun with more room, so try this one in the bathtub. You can also experiment with the amount of baking soda and vinegar you add.
What’s going on?
If you mix baking soda and vinegar, you get a chemical reaction which creates carbon dioxide gas. When this happens inside your bottle boat, the gas only has one way to escape, and that’s out the straw. The gas flying down the straw and out the back pushes the boat forwards.
Carefully cut a small hole in the bottom of the bottle, near to one edge. Note: This is a grownup step.
Then, cut a piece of the straw and poke it through the hole. Seal up the hole around the straw with hot glue or packing tape. You want the only path out of the bottle to be down the straw without any other leaks.