Science, Tech, Math › Science What Is the pH of Lemon Juice? How Acidic Are Lemons? Share Flipboard Email Print Alicia Llop / Getty Images 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 September 11, 2019 Lemons are extremely acidic. Any chemical with a pH less than 7 is considered acidic. Lemon juice has a pH of around 2.0, ranging between 2 and 3. To put that in perspective, the pH of battery acid (sulfuric acid) is 1.0, while the pH of an apple is about 3.0. Vinegar (a weak acetic acid) has a pH comparable to lemon juice, around 2.2. The pH of soda is about 2.5. The Acids in Lemon Juice Lemon juice contains two acids. The juice is about 5-8% citric acid, which accounts for the tart flavor. Lemons also contain ascorbic acid, also known as vitamin C. Key Takeaways: pH of Lemon Juice A lemon is an acidic fruit with a pH ranging from 2 to 3.The acids in lemons are citric acid, which makes lemons tart, and ascorbic acid, which is vitamin C.Because they are acidic and high in sugar, biting into lemons can damage tooth enamel. However, drinking lemon juice doesn't change body pH. Lemon Juice and Your Body Although lemons are acidic, drinking lemon juice really does not have an impact on the pH of your body. Drinking lemon juice increases the acidity of urine, as the kidneys rid the body of excess acid. The pH of the blood is maintained between 7.35 and 7.45, regardless of how much lemon juice you drink. While some people believe lemon juice has an alkalizing effect on the digestive system because of its mineral content, there is no scientific data to support this claim. The acid in lemon juice will attack tooth enamel. Eating lemons and drinking lemon juice can put you at risk for tooth decay. Lemons are not only acidic but also contain a surprisingly high amount of natural sugars, so dentists typically caution patients about eating them.