Wednesday, September 30, 2020

Oozing Pumpkins Science Experiment

Halloween is coming!  Families will be carving pumpkins and decorating their houses with them.  When Halloween is over, these pumpkins will be thrown away, fed to animals, or tossed into compost piles.  But... these pumpkins can be used for something fun and educational before being disposed of... science!  Read on to learn more about a fun science experiment you can do with these leftover pumpkins.

Oozing Pumpkins

Making an oozing pumpkin is an exciting... and messy... way to teach children about chemical reactions.  A chemical reaction occurs when two or more substances are combined together to create something new.  In this experiment, you will combine vinegar and baking soda to make a 'foam' that consists of sodium acetate, carbon dioxide, and water.

For this science activity, you will need:

  • a carved pumpkin
  • dish soap
  • baking soda
  • vinegar
  • food coloring (optional)


  1. In a small bowl, combine some dish soap, food coloring, and baking soda.  Exact amounts aren’t necessary.  The more dish soap, vinegar and baking soda you use, the larger the chemical reaction will be!  Mix everything thoroughly.
  2. Pour the mixture into the bottom of the pumpkin.
  3. Slowly pour some vinegar into the pumpkin.
  4. Stand back and observe.  You should see a big, foamy, mess ooze from the pumpkin’s eyes, nose, and mouth!
Oozing Pumpkins

This science experiment can be done more than once.  Just dump everything out of the pumpkin and repeat the process.  You can experiment with different amounts of vinegar, baking soda, and dish soap to see what happens.

Important Notes  

Do NOT drink the vinegar or sodium acetate.  It will make you sick!  Also, if you have a compost pile, do NOT put your oozing pumpkin into it.  Vinegar, baking soda, and sodium acetate will destroy the beneficial microbes in your compost pile that makes everything to decompose.

Oozing Pumpkins

Have you tried this oozing pumpkins science experiment at home or in your classroom?  If so, what was it like?  Tell us about it in the comments below!

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  1. This looks like so much fun to make! Can’t wait to try ��

    1. Hehehehe... when you do... be sure to use lots of newspaper and paper towels... it can be VERY messy!

  2. This looks like a fun and easy experiment. Definitely sharing with my mom friends.

    1. It really is an easy experiment to do to. I hope you and your friends have fun giving this experiment a try!

  3. Fabulous tutorial!! The kiddos will LOVE THIS!! I'd love for you to share over at our weekly Wednesday Creative Crafts Linky Party
    Have a great week!
    Creatively, Beth