chemistry 3

Fizzy, Fun Valentine Science

Add a little science to Valentine’s Day and see the reactions you get. What’s better than sweet-smelling, fizzy hearts? Toss them in the tub, toss them in the sink or toss them in a bowl and watch the chemical reactions bubble up.chemistry 2


What You Ned

  • 1 cup baking soda
  • 3/4 cup corn starch
  • 1/4 cup Epsom salt or cane sugar
  • 1/2 cup citric acid {available in spice sections or natural food stores for pickling and for canning}
  • Spray bottle with water
  • Food color (if you want)
  • Essential oils (if you want)
  • Mixing bowl
  • Measuring cups
  • Mixing spoon
  • Cooking spray
  • Muffin tin
  • Muffin cups
  • marbles


What You Do

  1. Make your dry mix
    1. In a large bowl, add the baking soda, corn starch, salt or sugar and citric acid.
    2. Mix well.
  2. Prep your sprayer
    1. Add a few drops of red or pink food coloring to your spray bottle of water.
    2. Add a few drops of essential oil to the spray bottle.


spray bottle

3. Mix your wet with your dry.

  1. Give your dry ingredients a spritz or two. You want to start slow.
  2. Wet the dry mix just enough to so that the mixture forms a clump when you squeeze it, but not so much that it looses its fizz or turns into soup.
  3. Listen to your mix. You can hear the fizzing after the first spray.

heart shape liners4. Make your heart shapes.

  1. Line your muffin tin with paper muffin cups.
  2. On one side place a small marble on the outside of the paper. You will see a heart shape appear in the paper liner.
  3. Gently spray the paper cups with cooking spray. This keeps the mixture from sticking to the paper after it dries.
  4. Scoop your mixture into the paper cups.
  5. Adjust the marble on the outside to get the heart shape you want.
  6. Let it all dry for an hour or so.
  7. Then take the paper lined hearts out of the in and set them o the couter to dry overnight.
  8. Gently pop your hearts out.
  9. Store them in an airtight plastic bag or container.

5. Make your hearts fizz

  1. Toss your hearts in the tub with you. Place them in a bowl of water or even the sink.
  2. See the bubbles?
  3. Feel the fizzy. What does it feel like? Is it warner than the water or colder?
  4. How long does it last?

fizzy bath bombs

What’s Going on?

When you drop your fizzy bomb into water it has a chemical reaction. Citric acid is an acid and the baking soda is a base. When you mix an acid and base you get a reaction. They create a gas—carbon dioxide. But since the citric acid and baking soda are dry they can’t interact as well and so they don’t react when they’re dry. Once you add water the acid and the base can now reach each other and they react creating fizzy carbon dioxide bubbles.

bathing beauty