This experiment is good and safe. It's from our kid science book. I've done this experiment 10 times I think. My mom is going to tell you how to do this.
Mix 2 tsp baking soda in a glass filled half-way with water. Put the glass in a container as this will overflow. Pour vinegar into the glass and watch it foam! The base (baking soda) neutralized the acid (vinegar)
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