Erupting Chocolate Ooblek

Chocolate Ooblek (3)

Today I made Veronika a new version of ooblek. Wanting to make this one stand out from the crowd, not only did this version feature chocolate, but it could explode! And yes this activity is toddler safe.

As a reminder ooblek is about 2 parts cornstarch to 1 part water. From there, there are so many ways to fancy it up. Unfortunately I messed up the texture of our ooblek from the get-go because I thought I had a full box of cornstarch in the pantry. It turned out I only had less than 1 cup left, and I’d already poured in over 1 cup of water to a plastic tub. So our mixture was on the watery side, not true ooblek.

But that’s okay, because there was more for Veronika to play with here! First, we sprinkled on cocoa powder in addition to the cornstarch. This was purely for the heavenly smell. Yum!

Chocolate Ooblek (1)

We also added 2 tablespoons baking soda because we wanted our ooblek to erupt. (Note: Be careful, because the baking soda will offset the now-solid-now-liquid property of ooblek, as it will dissolve in the water).

To make the explosions, add white vinegar to squeeze bottles and squirt in a bit at a time. This is great for exercising those little fingers.

Chocolate Ooblek (4)

Veronika almost couldn’t believe it when the first bubbles appeared. I had to help out with lots of the squeezing, but she was transfixed watching the eruptions every time the vinegar hit the baking soda.

Chocolate Ooblek (6)

The resulting bubbles are really neat ones, too, almost like honeycomb, but with a quasi-solid texture. They won’t pop until you pop them!

Chocolate Ooblek (7)

This made for lots of fun poking and prodding. Veronika was a little hesitant to get her hands messy, but adding a spoon helped her get in there.

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There also was also an added auditory component to the fun, thanks to the hissing sound whenever baking soda mixed with the vinegar.

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In sum, this project made for one happy girl!

Chocolate Ooblek (10)


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