Around Valentine’s Day, my kids get lots of those candy conversation hearts. I remember as a kid, I loved reading the messages on them. The messages are a bit different these days (“Text me”?) Save a few of those hearts to do this quick 5 minute science experiment. Use up some candy, do a little science, watch a little dance.
Here’s what you’ll need to get started:
- Candy Conversation Hearts
- Tall clear glass (we used a tall glass and a test tube)
- Baking Soda
- Measuring spoon
Add 1 cup of water to a clear tall glass or tall test tube. You can color yours purple or red for Valentine’s Day but that is totally optional.
Add in 2 teaspoons of baking soda and mix well.
Add a few candy hearts to the glass.
We used one of each color.Watch the hearts sink to the bottom of the glass.
Add about 1/4 cup of vinegar to the glass slowly (or else it will will overflow!)
Watch the candy hearts dance… or in our case, only the pink and orange hearts danced. The rest stayed happily at the bottom of the glass.
It really looked so cool watching the hearts float up and then sink down.
We will definitely be trying this again by testing the different colored hearts separately, testing different brands and testing different fizzy liquids to see if any of those change how the hearts behave.
For more Valentine’s Science Activities, try these:
For more floating and sinking activities, try these:
The Science Behind the Activity:
This is a great experiment demonstrating sinking and floating. The hearts are denser than the liquid so they initially sink when you put them in. When the vinegar is added, the reaction creates carbon dioxide gas. As the carbon dioxide gas bubbles attach to the surface of the hearts, they decrease the density of the hearts and the hearts float to the top. At the surface of the liquid, the gas bubbles pop and the hearts sink back down. The process keeps repeating until there isn’t enough carbon dioxide left to raise the hearts.
To see where I got the idea from and more details, follow the link below: