Dissolving Peeps Experiment

What to do with all those Peeps your kids got form the Easter Bunny?  My oldest superhero came up with this fantastic idea on his own!  He wanted to know what liquids a Peep would dissolve in.  You can set this experiment up in just a few minutes with a few common items from your fridge and pantry and of course, ALL those Peeps!

Here’s what you need to get started:

  • Peeps (we used 5 to test 5 different liquids)
  • 5 common household liquids (we used: water, apple juice, milk, vinegar and ginger ale)
  • 5 glasses
  • Observation sheet (optional)


We set up the experiment by filling each glass with a different liquid.  My oldest superhero wrote labels for each of the glasses.


I had the superheroes make a prediction of what they thought would happen when the Peep was placed into each of the different liquids.

IMG_1289 IMG_1287

They placed the Peeps into the liquids and we left them overnight.  (The Peep in the milk was placed in the fridge)


After 2 days, this is what we observed:

IMG_1398The Peep in the water looked a bit bloated.  The water turned blue from the clue colored sugar on the Peep.  The bottom of the Peep turned white where it was submerged in the water.  It did not dissolve in the water.

The Peep in the milk looked much like the one in the water.  The milk took on a slight yellow color from the sugar.  The Peep did not dissolve in the milk.

The Peep in the apple juice also did not dissolve.  The apple juice turned to a brownish green color form the sugar on the Peep.  It also began to grow mold as you can see from the photo I took looking up from the bottom of the jar.



Looking from the bottom of the jar with apple juice

The Peep in the vinegar bubbled a bit and was pretty bloated and also colored the water yellow.  Even the vinegar could not dissolve the Peep.


Lastly, we checked the Peep in the ginger ale soda.  It was also bloated with a bit of bubbling.  It also turned the liquid a funky brownish green color but what was interesting was the dark brown line where the Peep began to grow mold.


Here’s a view of the mold that grew on the bottom of the Peep.  But even soda could not dissolve this Peep.


Moral of the activity: Peeps are indestructible.  Kind of makes you wonder why we bother to eat them?

Science Behind the Activity:

This experiment was fantastic for a number of reasons.  First my eldest superhero came up with the idea on his own and selected the liquids he wanted to test.  Second, the boys made predictions and recorded them on his observation sheet which is great to get their awesome brain juices bubbling in there!  Lastly, the boys observed the changes over time (requires patience on their part).  This is a great example of using the scientific method without specifically teaching the scientific method.  And as a bonus, we got a chance to discuss several interesting phenomena:

  • Why some liquids grew mold and others didn’t
  • Why the liquids changed colors
  • What might have happened if we had left the milk at room temperature?
  • What other liquids we can try next time?
  • What connection the inability to dissolve a Peep might have to do with how unhealthy it is to eat.


This could also be done with a variety of different substances or just plain marshmallows.  Upon doing some research on the internet, it appears that liquid laundry detergent might be an interesting liquid to try.

Here’s where I got my idea from: http://www.momto2poshlildivas.com/2012/03/dissolving-peeps-experiment.html

Check out my other science activity using Peeps: Peeps Sailboats

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