standardinredoxpotentialin
The standard redox potential, often denoted E°, is the equilibrium potential of a redox couple under standard conditions. It is defined relative to the standard hydrogen electrode (SHE), which is assigned a potential of 0.00 volts. Standard conditions usually mean a temperature of 25°C (298 K), activities of all solutes equal to 1 (approximately 1 M for aqueous species), and a pressure of 1 atmosphere for any gases involved. E° is typically reported as a reduction potential, indicating the tendency of a species to gain electrons.
E° values are measured for half-reactions and are used to compare the driving force of different redox
The Nernst equation relates E° to the actual potential under non-standard conditions: E = E° − (RT/nF) ln
Standard redox potentials are tabulated for many common couples and underpin predictions of reaction direction, battery