Skip to content

Craft StationsNo. 2633 · The 2026 edition

Pumpkin Baking Soda Vinegar Experiment

Turn your kitchen into a spooky lab with this bubbling pumpkin science activity!

Medium

Our own summary of the original — the full post and photos live at hellowonderful.co.

Pumpkin Baking Soda Vinegar Science Experiment. Use cups and carve out Jack O'Lantern faces to do this classic Halloween science project. — PHOTO · HELLOWONDERFUL.CO

This Halloween-themed science experiment uses orange paper cups as mini pumpkins. Kids (with adult help) carve faces into the cups, then add baking soda and food coloring before pouring in vinegar for a fizzy, foaming reaction that simulates a bubbling pumpkin.

You'll need

Orange paper cups
Craft knife
Baking Soda
Vinegar
Orange gel food coloring
Shallow plastic bin

Directions

Use a pencil to sketch jack-o'-lantern faces onto the orange paper cups, then have an adult cut them out with a craft knife.
Slice the bottom circle off each cup so it is open at both ends.
Place the cups upside down (large open side down) into a shallow plastic bin.
Inside each cup, add 1 tablespoon of baking soda and 3 drops of orange gel food coloring—adjust the drops for desired vibrancy.
Pour vinegar into the cups and watch the fizzy, foaming reaction erupt!

More photos

Pumpkin Baking Soda Vinegar Science Experiment. Use cups and carve out Jack O'Lantern faces to do this classic Halloween science project.

Pumpkin Baking Soda Vinegar Science Experiment. Use cups and carve out Jack O'Lantern faces to do this classic Halloween science project.

Orange paper cups cut into jack o' lantern faces for baking soda vinegar experiment.

Orange paper cups cut into jack o' lantern faces for baking soda vinegar experiment.

Baking Soda Vinegar Pumpkin Cup Experiment. Great way to talk about emotions.

Photos hosted by hellowonderful.co.

Open the original on hellowonderful.co