We started with a pie pan filled with baking soda (actually, two of them, as I figured Meg would want to do this a few times - I was correct!), some small containers filled with vinegar tinted with food coloring (liquid watercolor would work, too), and a medicine dropper (these eyedroppers/pipettes will soon be on their way to our house, but the medicine dropper worked really well).
I only had to show Margaret a couple times the squeeze, dip, let go, and squeeze technique and she was off! She kept chanting the steps to herself as she did the activity.
She used a squeeze of each color in the first pan and made a lovely rainbow of miniature eruptions.
|Colored baking soda with the excess vinegar dumped out.|
In the second tray, she seemed to prefer using up each color before moving on to the next.
|The blue and green looked quite pretty, like ocean water against the white baking soda "sand."|
|The addition of the red vinegar made things a bit murky.|
|And the yellow finished the whole thing off with some of that good old "preschool brown" we all know and love.|
I didn't use much baking soda, maybe 1/2", and I could have used less. The activity lasted a good half hour, and there was more "eruption power" left in the baking soda, but Meg decided to dump the remaining tinted vinegar into the pan to see a BIG eruption.