E cell

[105561735]

What is the main difference between the two E cell equations and what prior information do I need to understand to get a better grip on the information

[205538966]

Both Ecell and E°cell represent cell potentials but under different conditions and circumstances.

E°cell is the standard cell potential under standard conditions (298 K, 1 atm pressure, and 1 M concentration for both anode and cathode).

Ecell however is the cell potential under non standard conditions (various temperatures, pressures, and concentrations). Ecell can also change as the reaction proceeds.

The equation to relate both is E cell = E°cell - (RT/nF)lnQ

[Charlotte Norris 2K]

The equation that includes both E and E* is used to calculate Ecell in non standard conditions, while the equation for E*=RT/nF x lnK is used to calculate E* under standard conditions given other information or to determine the equilibrium constant given E*