Science, Tech, Math › Science Standard Reduction Potential Definition Share Flipboard Email Print Sinhyu / 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 September 03, 2019 The standard reduction potential is the potential in volts generated by a reduction half-reaction compared to the standard hydrogen electrode at 25 °C, 1 atm and a concentration of 1 M. The standard reduction potential is defined relative to a standard hydrogen electrode, which is assigned the potential 0.00 V.Standard reduction potentials are denoted by the variable E0. Example The reduction of water:2 H2O + 2 e- → H2 + 2 OH-has a E0 = 1.776 V Source Stumm, W.; Morgan, J. J. (1981). Aquatic Chemistry (2nd ed.). John Wiley & Sons, New York.