Foamy Rainbow Eruption Mountains: A Colorful Science Experiment for Kids

Watch science come alive with this explosive, colorful DIY experiment! Create mesmerizing rainbow “volcanoes” that erupt with foamy, vibrant “lava”—perfect for curious kids and hands-on learning.

Materials Needed

• Small plastic cups or bowls (3–5)
• Baking soda (1 tbsp per cup)
• Vinegar (½ cup per eruption)
• Dish soap (a squirt per cup)
• Food coloring (assorted rainbow colors)
• Tray or large shallow pan (to contain the mess)
• Spoon or stir stick

Step-by-Step Instructions

Build Your Rainbow Mountains

• Arrange small cups on a tray, spacing them out like a mountain range.

Mix the Magic Eruption Base

• In each cup, add 1 tbsp baking soda and a squirt of dish soap (this makes the foam extra bubbly!).

Add a Burst of Color

• Stir in different food coloring into each cup for a vibrant rainbow effect.

Eruption Time!

• Slowly pour ½ cup vinegar into one cup and watch the foamy lava explode!
• Repeat with the remaining cups for a full rainbow eruption show.

Experiment & Play!

• Try mixing colors by pouring vinegar into two cups at once—watch the lava blend into new shades!

Pro Tips for Maximum Fun

✔ Use a deep tray to contain the fizzy mess for easy cleanup.
✔ Rinse and reuse cups to repeat the experiment again and again!
✔ Try different vinegar temperatures—does warm vinegar make a bigger reaction?

FAQs

Why does this experiment work?

The baking soda (base) and vinegar (acid) react to create carbon dioxide gas, while the dish soap traps the gas in bubbles, making foamy “lava.”

Can I use other colors?

Yes! Try neon food coloring or glow-in-the-dark paint under a blacklight for a cool twist.

Is this experiment safe for toddlers?

Yes, with supervision! The ingredients are non-toxic, but avoid getting vinegar in eyes.

Conclusion

This foamy rainbow eruption experiment is a fantastic way to combine science and art while keeping kids engaged. Perfect for rainy days, classroom activities, or just fun family bonding!

Try it today and watch their faces light up with every colorful explosion!