Some of the things we find in kitchens are acids. Acids are found in foods that taste sour. Here is a way to use baking soda to identify acids in the kitchen. When baking soda is mixed with an acid, bubbles of carbon dioxide form. If baking soda is mixed with a base or a neutral (neither an acid nor a base), no bubbles form.

Materials Needed
* baking soda
* water milk
* vinegar
* fruit juices (for example, lemon, pineapple, orange, apple)
* liquid soap
* several small cups

Place about a teaspoon of baking soda in each of the small cups. Add some of each liquid to the baking soda. If bubbles form, you've found an acid!