This is an old favorite that’s a staple at science fairs. To make your own volcano, follow the directions below. (Be sure to supervise young children.)
ARM & HAMMER™ Baking Soda
Cardboard Plaster of Paris
4 oz plastic cups
Red food coloring
Hand dishwashing liquid
Making the volcano:
Step 1: On baking sheet (or other easily cleaned surface), shape cardboard into broad cone shape using the cup to form a “crater” at the top of the volcano.
Step 2: Use plaster of Paris over the cone to form the volcano (do not get plaster into the crater). Allow volcano to dry completely.
Step 3: Paint or decorate volcano as desired.
Making the eruption:
Step 1: Mix ¼ cup vinegar with dishwashing liquid, water, and red coloring in a plastic cup.
Step 2: Put 1 teaspoon of ARM & HAMMER™ Baking Soda in a small, empty plastic cup. Place this cup inside the volcano crater.
Step 3: Quickly pour vinegar mixture into the ARM & HAMMER™ Baking Soda cup in the crater.
Enjoy the “lava” as the volcano erupts! The ARM & HAMMER™ Baking Soda reacts with the vinegar in the mixture and produces a gas: carbon dioxide (CO2). The gas releases bubbles through the dishwashing liquid and food coloring, creating the bubbly, red lava.