Science, Tech, Math › Science Acid & Base Science Fair Project Ideas These fun projects teach you about acid, bases, and pH Share Flipboard Email Print MMassel/Getty Images Science Chemistry Projects & Experiments Basics Chemical Laws Molecules Periodic Table 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 September 22, 2019 Are you looking for a science fair idea involving acids, bases, or pH? Here are some ideas to get you started: Measure the amount of vitamin C (ascorbic acid) in orange juice (or another juice). Test to see how the amount of vitamin C changes after the juice is exposed to air (or light or heat).Simulate acid rain by adding an acid to water. You can use pH paper to test whether the acidity is changed after water is run through different types of soil or through plant root systems.Is the acidity of apples (malic acid) affected by their ripeness?See if you can make your own pH indicator from common plants or chemicals.Measure the pH of common acidic beverages (soft drinks, lemonade, orange juice, tomato juice, milk, etc.) and examine how easily they corrode metal (such as iron). Another idea: which is more corrosive? A salt solution or an acidic liquid?Do all brands of orange juice contain the same amount of ascorbic acid?Compare the effects of different acidic fruit juices and liquids (e.g., vinegar) for preventing apple browning.Which animal's saliva has the lowest pH? (You could test humans, dogs, cats, possibly other species.)What is the effect of pH on growth or survivability of daphnia (an aquatic crustacean)? You could test other factors too, such as salinity or the presence of detergent in the water.How does the pH of the water affect tadpole development?Does acid rain (real or simulated) affect the number and type of organelles seen in algae under the microscope?Which is a better conductor of electricity, an acid or a base?Does the pH of water affect the growth or survivability of mosquito larvae?