Description
Transform ordinary baking soda into explosive treasure rocks that fizz and dissolve in vinegar. Kids discover hidden toys while learning about chemical reactions. Perfect for rainy days, science lessons, or birthday party activities.
Ingredients
3 cups baking soda
1 cup water
Small waterproof toys or treasures (plastic gems, mini dinosaurs, coins)
2 cups white vinegar (for dissolving)
Food coloring (optional)
Glitter (optional)
Instructions
1. Combine baking soda and water in a large bowl, mixing until you get a thick, moldable paste that holds together like wet sand.
2. Press treasures into the center of handfuls of mixture, then shape into golf-ball sized rocks. Pack mixture tightly around each treasure.
3. Place rocks on a baking sheet and let dry completely for 24-48 hours, or speed up by placing in 200°F oven for 2 hours.
4. Set up a tray or bin with sides. Pour vinegar into spray bottles or small cups with droppers.
5. Place dried treasure rocks in the tray. Let kids spray or drip vinegar onto rocks and watch them fizz away, revealing hidden treasures inside.
Notes
Used baking soda from previous experiments works perfectly. Let it dry completely and it reacts just as well the second time.
Choose waterproof treasures only. Plastic toys, glass gems, metal coins, and rubber figures work best.
Add food coloring to create different colored rocks. Layer colors for rainbow surprise rocks.
Make extra rocks and freeze for future play sessions.
The vinegar-baking soda mixture washes away easily with water for simple cleanup.
- Prep Time: 15 minutes
- Cook Time: 2 hours
- Category: Kids Activity
- Method: No-Bake
- Cuisine: American
Nutrition
- Serving Size: 1 rock