If someone were to ask, "Do you drink acid?" you might laugh and say, "Of course not!" But guess what? If you drink soda pop -- whether it's diet or filled with sugar, with caffeine or caffeine-free -- you're drinking acid ... or at least, you're drinking an acidic liquid.
And although you may think your favorite soda is great, your teeth aren't as happy with it as you are. Because soda pop is an acidic beverage, it's bad for your teeth -- the acid can dissolve calcium. And that's bad because calcium keeps your teeth strong.
Try the following experiment to see if your favorite soda (and other liquids) are acidic.
What You'll Need:
- Yellow soda (such as Mountain Dew)
- Club soda
- Lemon juice
- 4 test tubes
- pH indicator strips (available in hobby shops)
Step 1: Pour 1 milliliter each of milk, yellow soda, club soda, and lemon juice into separate test tubes.
Step 2: To find out if the liquids are acidic, neutral, or alkaline, dip a separate piece of pH paper into each.
Step 3: Compare the color of the papers or solutions to the pH indicator chart on the side of the container. Write down the pH of each solution.
Some liquids are acidic and others are alkaline. Milk is alkaline; it contains a lot of calcium. Soda and lemon juice are acidic, in part because both contain citric acid. Don't stop here -- find the pH of other drinks.
When you've finished testing the lemon juice, you can use it to create secret messages. Keep reading to find more fun science projects for kids.