Science, Tech, Math › Science Ketchup and Baking Soda Volcano Natural Orange-Red Nontoxic Lava Share Flipboard Email Print Ketchup contains vinegar, which reacts with baking soda to produce an extra-special lava for a chemical volcano. Corbis via Getty Images / 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 November 03, 2017 The acetic acid in ketchup reacts with baking soda to produce an extra-special type of lava for a chemical volcano. This non-toxic volcano recipe is sure to please! Ketchup & Baking Soda Volcano Materials small container (I used an empty travel-size bottle.)volcano (You can mold it from clay or use a cardboard form.)ketchupbaking sodaliquid dishwashing soap (optional)water (optional) Make the Volcano Erupt This is really easy! Swirl together a squirt of dishwashing detergent (if you want foamy orange lava), ketchup, and enough water to achieve the desired thickness. When you are ready to start the eruption, add baking soda. Alternatively, you could mix together the baking soda, detergent, and water. Add the ketchup when you're ready for the eruption.The 'lava' erupts slowly and steadily, rather than forcefully, so this is a nice volcano to make if you want a longer-lasting eruption. How the Volcano Works The ketchup contains vinegar, which is dilute acetic acid. The acetic acid reacts with the baking soda to produce carbon dioxide gas. The gas bubbles expand and rise through the liquid, bubbling out the ketchup.