Nernst equation derivation

Which information is provided by Nernst equation?

In electrochemistry, the Nernst equation is an equation that relates the reduction potential of an electrochemical reaction (half-cell or full cell reaction) to the standard electrode potential, temperature, and activities (often approximated by concentrations) of the chemical species undergoing reduction and oxidation

What is F in G =- nFE?

The relationship between ΔGo Δ G o and Eo is given by the following equation: ΔGo=−nFEo. Here, n is the number of moles of electrons and F is the Faraday constant (96,485Coulombsmole ).

What is the meaning of N in Nernst equation?

n = number of moles of electrons transferred in the balanced equation. F = Faraday’s constant, the charge on a mole of electrons = 95,484.56 C/mol.

What is Nernst equation give examples?

log Kc = (nEcell)/0.0592V Thus, the relationship between the standard cell potential and the equilibrium constant is obtained. When Kc is greater than 1, the value of Ecell will be greater than 0, implying that the equilibrium favours the forward reaction.

Why is Nernst equation important?

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.

What is the difference between ∆ G and ∆ G?

∆G: Gibbs Energy ∆G is the change of Gibbs (free) energy for a system and ∆G° is the Gibbs energy change for a system under standard conditions (1 atm, 298K). Where ∆G is the difference in the energy between reactants and products.

Can E Cell Zero?

1 Answer. No, Eo and △Go for cell reaction can never be zero.

How is K related to Delta G?

Q=K, the Reaction is at Equilibrium. delta G <0, the reaction is spontaneous. When K<1, the reaction favors the Reactants, so the Reaction is not Spontaneous, making delta G >0. but when K >1, the Reaction favors the Products, so it is Spontaneous, making delta G< 0.

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.

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.

How is Eion calculated?

In general: The equilibrium potential for an ion, Eion, is directly proportional to the log of the ratio of [ion]out divided by the [ion]in. R is the universal gas constant (8.314 J/deg-mole). We are dealing with diffusing molecules, reflecting the probability of an ion crossing the membrane.

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