A five-ingredient chemistry experiment that turns the kitchen counter into a lab. Kids mix baking soda, vinegar, and food coloring to watch an acid-base reaction fizz, foam, and change color in real time — no lecture required, just a question worth asking afterward: why did that happen?
Quick Facts
- Best for: Ages 8–12
- Time: 20–25 minutes
- Setting: Indoor, at a table you don’t mind getting a little wet
- Skill focus: Science — chemical reactions, hypothesis and observation
What You’ll Need
- Baking soda (1/2 cup)
- White vinegar (1 cup)
- Food coloring (a few drops, 2–3 colors)
- A shallow tray or baking dish
- A turkey baster or small dropper
- Dish soap (optional, for extra foam)
🛒 Helpful for This Activity
Kids’ Science Experiment Kit on Amazon — a ready-made kit like this includes droppers, trays, and extra reactions to try once this one’s a hit.
As an Amazon Associate, HappyLearningKids.com earns from qualifying purchases. This doesn’t cost you anything extra, and it never affects what we recommend.
Step-by-Step
- Spread the baking soda in an even layer across the tray.
- Add a drop of food coloring to a few small cups of vinegar, one color per cup.
- Let your child use the dropper to squeeze colored vinegar onto the baking soda, one section at a time.
- Watch the fizzing reaction and colors bleed together. Add a drop of dish soap to one section to compare how the foam changes.
- Before starting each new color, ask: “What do you think will happen this time?”
What They’re Learning
This is a real acid-base reaction: vinegar (acetic acid) reacts with baking soda (sodium bicarbonate) to release carbon dioxide gas, which is what creates the fizz. Beyond the chemistry, the activity builds the habit of predicting an outcome before testing it — the core of scientific thinking.
Parent Tip
Resist explaining the reaction before they’ve watched it happen a few times. Curiosity about “why” lands better after they’ve already seen the “what.”
Keep the curiosity going: try the Science Mystery game, where kids solve science clues detective-style.