Science, Tech, Math › Science Acidic Solution Definition Acidic Solutions in Chemistry Share Flipboard Email Print Blue litmus paper turns red under acidic conditions, while red litmus paper turns blue under basic conditions. David Gould, 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. Anne Marie Helmenstine, Ph.D. Facebook Twitter 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. Learn about our Editorial Process Updated on October 24, 2022 In chemistry, any aqueous solution can be classified as belonging to one of three groups: acidic, basic, or neutral solutions. Acidic Solution Definition An acidic solution is any aqueous solution which has a pH < 7.0 ([H+] > 1.0 x 10-7 M). An aqueous solution is one which has water as its solvent. While it's never a good idea to taste an unknown solution, acidic solutions are sour, in contrast to alkaline solutions, which are soapy. Examples: Lemon juice, vinegar, 0.1 M HCl, or any concentration of an acid in water are examples of acidic solutions. Cite this Article Format mla apa chicago Your Citation Helmenstine, Anne Marie, Ph.D. "Acidic Solution Definition." ThoughtCo, Oct. 24, 2022, thoughtco.com/acidic-solution-definition-606351. Helmenstine, Anne Marie, Ph.D. (2022, October 24). Acidic Solution Definition. Retrieved from https://www.thoughtco.com/acidic-solution-definition-606351 Helmenstine, Anne Marie, Ph.D. "Acidic Solution Definition." ThoughtCo. https://www.thoughtco.com/acidic-solution-definition-606351 (accessed June 8, 2023). copy citation