Science, Tech, Math › Science Normal Concentration Definition in Chemistry Share Flipboard Email Print Normal concentration is molar concentration divided by an equivalence factor. Glow Images, Inc / Getty Images Science Chemistry Chemical Laws Basics 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 May 06, 2019 There are two meanings for "normal" in chemistry. (1) Normal or normal concentration refers to a concentration of solutes that is the same in two samples. (2) Normality is the gram equivalent weight of a solution in a solution, which is its molar concentration divided by an equivalence factor. It is used in situations where molarity or molality might be confusing or else difficult to determine. Normal concentration is also known as normality, N, isotonic. Examples (1) A 9% salt solution has a normal concentration with respect to most human body fluids.(2) A 1 M sulfuric acid (H2SO4) is 2 N for acid-base reactions because each mole of sulfuric acid provides 2 moles of H+ ions. A 2 N solution is called a 2 normal solution.