Materials:
- 1 small funnel
- 1 plastic water bottle
- 1 balloon
- 2 tbsp water
- 1/4 cup white vinegar
- 1 tsp baking soda
Pour the water and vinegar into the bottle. Use the funnel to pour the baking soda into the balloon. Stretch the open end of the balloon over the bottle opening and shake the balloon gently so that all the baking soda empties into the bottle.
Results:

Also, we found that if we doubled the recipe, it makes a very satisfactory ka-boom! when the balloon explodes and the baking powder flies all through the dining room!
Making science with my kids. I live for this.
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