Quick Answer: How Do You Write The Nernst Equation?

What is the importance of Nernst equation?

The Nernst equation is an important relation which is used to determine reaction equilibrium constants and concentration potentials as well as to calculate the minimum energy required in electrodialysis as will be shown later..

Why is Nernst equation used?

Nernst Equation – Can be used to find the cell potential at any moment in during a reaction or at conditions other than standard-state. Reaction quotient (Qc) – The mathematical product of the concentrations of the products of the reaction divided by the mathematical product of the concentrations of the reactants.

What is EMF of a cell?

The voltage or electric potential difference across the terminals of a cell when no current is drawn from it. The electromotive force (emf) is the sum of the electric potential differences produced by a separation of charges (electrons or ions) that can occur at each phase boundary (or interface) in the cell.

What is N in G =- nFE?

The “n” is the number of electrons transferred. If no electrochemical reaction occurred, then n = 0. Otherwise “n” is positive. Having a negative number of electrons transferred would be impossible.

What does the Nernst equation predict?

The Nernst equation accurately predicts cell potentials only when the equilibrium quotient term Q is expressed in activities. … The resulting Es can then be used to convert concentrations into activities for use in other calculations involving equilibrium constants.

What is Z Nernst equation?

Define the components of the general Nernst equation. E is the half-cell reduction potential, Eo is the standard half-cell reduction potential, z is the number of electrons transferred, aRed is the reduced chemical activity for the chemical in the cell and aOx is the oxidized chemical activity.

How does temperature affect the Nernst equation?

Temperature doesn’t affect the Nernst equation. It shows that Ecell decreases as T increases if Q ≠ 1 and everything else stays constant.

What affects the Nernst potential of K+?

If there are only K+ channels in a cell, then Vm in this cell will be the same as the K+ equilibrium potential (VK) which can be obtained from the Nernst potential for K+….Ionic SpeciesPotassium (K+)Intracellular Concentration150 mMExtracellular Concentration4 mMEquilibrium PotentialVK = −96.81 mV6 more columns•Feb 15, 2014

Where does the Nernst equation come from?

The Nernst Equation is derived from the Gibbs free energy under standard conditions.

What is Nernstian behavior?

Nernstian behavior: An electrode is said to behave “nernstially” if the equilibrium electrode potential obeys the Nernst equation when the concentration (strictly speaking, activity) of a species involved in the electrode reaction changes. Opposite: non-nernstian behavior.

What is Nernst equation give examples?

Nernst equation is a general equation that relates the Gibbs free energy and cell potential in electrochemistry. It is very helpful in determining cell potential, equilibrium constant etc. At standard temperature T = 298 K, the 2.303RTF, term equals 0.0592 V.