Zotz candies bubble when you bite into their super-sour center. How come?

A look at the ingredient list reveals the answer. Besides sugar and corn syrup, colors, and flavors, the candy contains malic acid, sodium bicarbonate, and tartaric acid. In other words, it's just an acid-baking soda reaction.

Here's a video of Zotz in water.

If you can't view the video, here's my six-year-old's illustration of the process. It's almost as good as the video (says his mother).

Next time you try Zotz, remember to enjoy the bubbles. You're eating a self-contained acid test!


  1. Loralee, thanks for this information, which only you have troubled to explain with such clarity. I'm trying to write a paragraph about the few candies since 1960 that have been truly innovative, and I want to explain the chemistry of Zotz. Candy Experiments to the rescue! Baking soda reacting with acid. Exactly what I needed to know.

  2. If you had any more questions, you could try emailing the company. I emailed them to confirm the chemistry behind the bubbles, and they answered back quickly.


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