Create a vinegar and baking soda explosion
Mix vinegar and baking soda to create a safe foaming eruption, observe gas production, and measure reaction strength with adult supervision.
About this activity
Mix vinegar and baking soda to create a safe foaming eruption, observe gas production, and measure reaction strength with adult supervision.
What you need
Step by step
- 1
Step 1
Put on your safety goggles.
- 2
Step 2
Put the tray on a stable table.
- 3
Step 3
Set the clear plastic bottle in the middle of the tray.
- 4
Step 4
Measure 1/2 cup of vinegar into the measuring cup.
- 5
Step 5
Pour the measured vinegar into the bottle using the funnel.
- 6
Step 6
Make a small paper packet that holds 1 teaspoon of baking soda.
- 7
Step 7
Place the ruler upright beside the bottle with the zero at the bottle base.
- 8
Step 8
Put the notebook and pencil next to the bottle to write observations.
- 9
Step 9
With an adult's help drop the baking soda packet into the bottle.
- 10
Step 10
Immediately start the timer.
- 11
Step 11
Watch the foam rise.
- 12
Step 12
Stop the timer when the foam reaches its highest point.
- 13
Step 13
Measure the foam height with the ruler and write the height and time in your notebook then change the amount of baking soda or vinegar and repeat to compare results.
- 14
Step 14
Share a photo and what you measured about your foaming eruption on DIY.org.
Fun facts
How do I create a vinegar and baking soda explosion and measure reaction strength?
To do the activity, set up outside or on a tray with adult supervision. Put a small plastic bottle or cup on the tray, add measured baking soda (start with 1–2 teaspoons). Add a few tablespoons of vinegar (1–3) and optional food coloring or a squirt of dish soap for more foam. Pour vinegar into the container quickly, step back and observe foam, measure peak foam height with a ruler or capture gas in a balloon to compare reaction strength between trials.
What materials do I need for a vinegar and baking soda eruption experiment?
Materials needed include white vinegar, baking soda, a sturdy plastic bottle or cup, measuring spoons and cups, a tray or pan to catch spills, a funnel or paper cone, dish soap and food coloring (optional), a ruler or tape measure to gauge foam height, a balloon if you want to collect CO2, safety goggles, gloves, and paper towels for cleanup. Adult supervision is required throughout.
What ages is this vinegar and baking soda experiment suitable for?
This experiment is best for children aged about 4 and up with close adult supervision. Preschoolers (4–5) can pour and watch with help; ages 6–8 can measure ingredients and record observations; 9–12-year-olds can design trials to measure reaction strength and graph results. Toddlers under 3 should not do this unsupervised because of ingestion and choking risks. Always tailor complexity and safety precautions to the child's maturity.
What are the benefits, safety tips, and easy variations for this activity?
Benefits include hands-on learning about chemical reactions, CO2 gas production, hypothesis testing, measurement skills, and fine motor practice. Safety tips: work on a tray outdoors or in a sink, wear goggles, never seal reactions in closed containers, keep hands and face away from splashes, and dispose of leftovers down the drain with plenty of water. Variations: add dish soap for thicker foam, change vinegar/baking soda amounts to compare strength, or use lemon juice as a milder acid.
Watch & Learn
Need help?
What can I use if I don't have a funnel or safety goggles mentioned in the steps?
Roll a piece of paper into a cone as a funnel to pour the measured 1/2 cup of vinegar into the bottle and wear safety glasses or a face shield if safety goggles are unavailable.
The baking soda packet opened early or the foam started before I could start the timer—how do I fix that?
Fold the small paper packet that holds 1 teaspoon of baking soda tightly and seal it with tape so it won't open, have an adult drop it into the bottle while you immediately start the timer, and keep the tray under the bottle to catch overflow.
How can I adapt this volcano experiment for different ages?
For younger children pre-measure the 1/2 cup vinegar and prepare taped baking soda packets for an adult to drop while they watch and draw in the notebook, and for older kids let them change the amounts of baking soda or vinegar, time and measure the foam height with the ruler, and record results for comparison.
How can we extend or personalize the activity after completing the steps?
Try adding food coloring to the 1/2 cup vinegar, test different bottle sizes or varied baking soda/vinegar amounts to compare foam height and time with your ruler and timer, then share a photo and your measurements on DIY.org.