What is Nernst equation for redox reaction?

= E o M n + / M. – 2.303 R T n F log ⁡ 1 [ M n n + ] This relation connecting reduction potential measurable at conditions other than standard conditions to the standard electrode potential is the Nernst equation.

What does the Nernst equation tell us?

The Nernst Equation enables the determination of cell potential under non-standard conditions. It relates the measured cell potential to the reaction quotient and allows the accurate determination of equilibrium constants (including solubility constants).

What is Nernst equation and its application?

The Nernst equation offers the connection in between cell potential of the elctrochemical cell, temperature, standard cell potential, and the “Q” reaction quotient. Surprisingly, taking non-standard conditions under consideration, electrochemical cells’ cell potential can be find out using Nernst Equation.

What is the relationship between Butler Volmer and Nernst equation?

It agrees with the Nernst equation when current density is zero, J=0. Therefore, for a very fast reaction where exchange current density is infinity (J0→∞), the Butler–Volmer equation gives the same potential difference as the Nernst equation. This is equally even true under high-resistance conditions.

What are the limitations of Nernst equation?

The Nernst Equation is only applicable when there is no current flow through the electrode. When there is current flow, the activity of ions at the electrode surface changes and there are additional over potential and resistive loss terms which contribute to the measured potential.

Why Butler-Volmer equation is used?

The Butler-Volmer equation is widely used in electrochemical theory to describe the relation between electrode potential (vs. a suitable reference electrode) and current density.

Why is the Nernst equation not valid?