Free Project: Potion Station from Tinkerlab

Most kids are mesmerized by the process of pouring vinegar onto baking soda, watching it fizzle, and then sprinkling more baking soda on top to start all over again. Since that first introduction to vinegar and baking soda, know to many as the Volcano Experiment, we've recreated this and other similar mad scientist experiences more times than I can remember. There are lots of ways to make potions, and this experiment includes a few of our favorite ingredient combinations.

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from Tinkerlab: A Hands-On Guide for Little Inventors
by Rachelle Doorley