STANDARD REDUCTION POTENTIALS KEY TERMS AND CONCEPTS
CONCEPTS
· All the entities in the cell equation for a standard cell are pure substances under SATP and/or solutions with a concentration of 1.0 mol/L.
· The standard hydrogen half-cell, by definition, has a reduction potential of exactly 0 V. All other potentials are measured relative to this reduction potential.
· The standard cell potential, ΔE0r(cell), can be predicted from the reduction potentials listed in a standard reduction potentials table, using the formula
ΔE0r(cell) = Eor(cathode) – Eor(anode)
· By convention, standard half-cell potentials are written as reduction potentials. This indicates the tendency of a half-cell to undergo reduction.
· The value of the standard cell potential is positive if the cell reaction occurs spontaneously.
· The standard reduction potential E0r represents the ability of a standard half-cell to attract electrons, relative to the reference half-cell.
· The standard hydrogen half-cell, by definition, has a reduction potential of exactly 0 V. All other potentials are measured relative to this reduction potential.
· The standard cell potential, ΔE0r(cell), can be predicted from the reduction potentials listed in a standard reduction potentials table, using the formula
ΔE0r(cell) = Eor(cathode) – Eor(anode)
· By convention, standard half-cell potentials are written as reduction potentials. This indicates the tendency of a half-cell to undergo reduction.
· The value of the standard cell potential is positive if the cell reaction occurs spontaneously.
· The standard reduction potential E0r represents the ability of a standard half-cell to attract electrons, relative to the reference half-cell.
KEY TERMS
Cell Potential:
The electric potential difference (voltage) between the two half-cells in a galvanic cell.
Volt (V):
The SI unit of a galvanic cell. Its unit symbol is V, where 1 V is equal to joules per coulomb, or J/C.
Joule (J):
The SI unit of work and energy.
Coulomb (C):
The SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.
Ampere:
The SI base unit of electric current, equal to a flow of one coulomb per second.
Standard Cell:
A galvanic cell in which all the entities involved in the half-cell reactions are at SATP and the solutions have a concentration of 1.0 mol/L.
Standard Cell Potential (ΔE0r(cell)):
The electric potential difference of a galvanic cell that is operating under standard conditions.
Standard Reduction Potential (E0r):
The ability of a half-cell to attract electrons in a cell that is operating under standard conditions.
Standard Hydrogen Half-Cell:
The galvanic cell from which all the half-cell potentials are determined; E0r = 0 V (by definition).
The electric potential difference (voltage) between the two half-cells in a galvanic cell.
Volt (V):
The SI unit of a galvanic cell. Its unit symbol is V, where 1 V is equal to joules per coulomb, or J/C.
Joule (J):
The SI unit of work and energy.
Coulomb (C):
The SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.
Ampere:
The SI base unit of electric current, equal to a flow of one coulomb per second.
Standard Cell:
A galvanic cell in which all the entities involved in the half-cell reactions are at SATP and the solutions have a concentration of 1.0 mol/L.
Standard Cell Potential (ΔE0r(cell)):
The electric potential difference of a galvanic cell that is operating under standard conditions.
Standard Reduction Potential (E0r):
The ability of a half-cell to attract electrons in a cell that is operating under standard conditions.
Standard Hydrogen Half-Cell:
The galvanic cell from which all the half-cell potentials are determined; E0r = 0 V (by definition).
References
- Di Guiseppe, M., Haberer, S., Salciccioli, K., Sanader, M, Vavitsas, A. (2012) Chemistry 12. Toronto: Nelson Education Ltd.
- van Kessel, H., Jenkins, F., Davies, L., Plumb, D., Di Guiseppe, M., Lantz, O., Tompkins, D. (2003). Chemistry 12. Toronto: Thomson Canada Limited.
- http://www.wikipedia.org