Question

Write the Nernst equation for the cell potential of a galvanic cell.

Mention the equation used to calculate the emf of a galvanic cell when its electrodes are not in the standard state.

Answer 1

The Nernst equation relates the cell potential (EMF) of a galvanic cell to the standard cell potential and the concentration of ions involved.

The nernst equation is given by

\[\ce{E = E^{\circ}_{cell} - \frac{0.0591}{n} log Q}\]

Where,

E_cell​ = Cell potential under non-standard conditions

\[\ce{E^\circ_{cell}}\]​ = Standard cell potential

n = Number of electrons transferred in the cell reaction

Q = Reaction quotient = \[\ce{\frac{[Products]}{[Reactants]}}\]