Science, Tech, Math › Science Acids and Bases Lesson Plan Share Flipboard Email Print pH paper strips. Anne Helmenstine Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated July 03, 2019 Acids, bases, and pH are core chemistry concepts that are introduced in elementary level chemistry or science courses and expanded upon in more advanced courses. This chemistry lesson plan covers essential acids and bases terminology and offers students hands-on experience testing common home chemicals to determine whether they are acids, bases or neutral. Time Required This lesson can be completed in 1-3 hours, depending on how in-depth you decide to get. Educational Level This lesson is best-suited for students at the elementary to middle school level. Materials red (purple) cabbagecoffee filtershousehold chemicals with a variety of pH levels. You can use this pH scale for ideas. Good choices include diluted ammonia, laundry detergent, milk, vinegar, water, soft drinks, and lemon juice. You may wish to prepare pH test strips in advance or this may be completed by the students. The simplest way to prepare test strips is to heat red cabbage leaves with a very small amount of water either in a microwave or else over a burner until the leaves are soft. Allow the cabbage to cool and then score the leaves with a knife and press coffee filters onto the cabbage to absorb the juice. Once a filter is completely colored, allow it to dry and then cut it into strips. Acids and Bases Lesson Plan Explain what is meant by acids, bases, and pH. Describe characteristics that are associated with acids and bases. For example, many acids taste tangy. Bases often feel soapy when rubbed between your fingers.List the materials that you've gathered and ask students to predict, based on their familiarity with these substances, whether they are acids, bases or neutral.Explain what is meant by a pH indicator. Red cabbage juice is the indicator used in this project. Describe how the color of the juice changes in response to pH. Demonstrate how to use pH paper to test pH.You can prepare pH solution or strips in advance or make this into a class project. Either way, have students test and record the pH of a variety of household chemicals. Assessment Ideas You may wish to provide an "unknown" and have students determine approximate pH. Based on the pH, is this an acid or a base? From a list of three chemicals with different pH values and characteristics, ask students to select the identity of the "unknown" sample.Have students research pH indicators and identify other common household chemicals they might use to test pH instead of using red cabbage juice.Ask students to explain, in their own words, the difference between acids and bases. What is meant by "neutral"? What does pH measure?