Dripping vinegar on baking soda is always amusing, but we decided to make it more interesting. First we spread a thin layer of baking soda on the bottom of a pan. Then, we mixed food coloring with the vinegar. Using eye droppers the kids got to see what happens when they meet.
The great thing about eye droppers is they also build fine motor skills. Holding the tip and squeezing helps build the same muscles that will be used for pencil grip. Also, the immediate gratification of bubbling keeps the kids focused.
At some point he decided just to dump one of the cups of vinegar into his pan. It wasn't nearly as interesting as he had expected, but she was nice enough to let him help her.
In case you don't know what to expect, here's a video of what happens.
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