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Exploring Everyday Acids and Bases Name___________________________Date_________Class_________ In this activity you will explore the effect of several common household chemicals on an acid/base indicator. Red cabbage juice contains a pigment that changes from purple to pink in the presence of an acid, and from purple to green when in contact with a base. Materials: (per group) 10 test tubes test tube rack dropper red cabbage indicator Samples of the following solutions: white vinegar Lysol cleaner liquid soap aspirin antacid salt solution lemon-lime soda Gatorade distilled water ammonia Procedure: 1. 2. 3. 4. 5. Put on safety goggles and lab apron. Label each test tube with the name of the solution being tested. Test each solution one at a time, filling the test tube about 1/3 full with the solution. Place about a dropper full of the indicator into the tube. Record your observations. Rinse test tubes and returned them to the designated container. Data and Observations: Record your results in the following table: SOLUTION Gatorade Lysol cleaner Liquid soap Aspirin Antacid Salt solution Lemon-lime soda Vinegar Ammonia Distilled Water OBSERVATIONS (color) Acid or Base? Analysis and Conclusions 1. What is an acid? 2. What color did the indicator turn in the presence of an acid? 3. Which of the substances tested were acids? 4. What general statement could you make about the pH of these substances? 5. What is a base? 6. What color was the indicator in the presence of a base? 7. Which of the substances tested were bases? 8. What can you say about the pH of these substances? 9. A solution with a pH of 7 is neither acidic nor basic. What term describes such a solution? 10. Weak acids and bases often serve as buffers. What is the function of a buffer?