Baking Soda Bomb Bags

There is an activity that is a classic – baking soda volcanoes.  The bomb bags are a fun update to this classic.  This has to be one of the most requested activities here at our respite home.  Very simple, very colorful and very messy.

Supplies needed –

  • quart size freezer bags
  • cornstarch
  • food dye
  • dish soap
  • vinegar
  • paper towels
  • baking soda
Bomb Bags

Bomb Bags

Step 1:  Put 1/4 cup cornstarch, generous squirt of dish soap and couple drops of food dye in the freezer bag.  Add about 1/2 cup of vinegar to the bag.

Tip:  Roll the top of the bag over about an inch or so.  Put your hand in the bag and press down.  It’ll sit up like a bowl like in the photo above.

Step 2:  Seal bag tightly and mix the ingredients together


Bomb Bags

Bomb Bags

Bags will look like the picture above when mixed properly

Step 3:  Place a piece of paper towel flat on a counter and pour a few spoonfuls of baking soda into the center.  Then fold the paper towel up around the pile.  I tell the kids this is the detonator.

Step 4:  Go outside with the paper towel detonator and the freezer bag.  have the kids put the detonator in the bag and then seal it up quickly.

Bomb Bags

Bomb Bags

Encourage the kids to shake the bags or throw the bags.    The bags swell up big like the picture above.  It’s safe enough if they pop while the kids are holding them as long as it doesn’t get into their eyes.


Bomb Bags

Bomb Bags

I also encourage the kids to walk through and stomp in the resulting mess.  The chemical reaction caused by the vinegar mixing with the baking soda creates a cold soapy mess – perfect for a warm day.

Bomb Bags

Bomb Bags

Check out this Science Activity for better instructions:  Bubble Bomb

I added food dye, dish soap and cornstarch because color is fun, so are bubbles.  The extra ingredients make this fun science experiment messier and in a kid’s world – messier tends to be more fun.


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