Exciting Calculation of Standard Emf in a Galvanic Cell!

How to calculate the standard emf of a galvanic cell?

Given the standard reduction potentials for Sn and Cu, how can we determine the standard emf of the galvanic cell?

Answer:

The standard emf (electromotive force) of the galvanic cell consisting of a Sn electrode and a Cu electrode at 25°C is 0.29 V.

To calculate the standard emf of the galvanic cell, we can use the Nernst equation, which relates the standard emf (E°cell) to the standard reduction potentials (E°) of the half-reactions involved:

E°cell = E°(cathode) - E°(anode)

In this case, Sn is undergoing reduction (acts as the cathode), and Cu is undergoing oxidation (acts as the anode). The standard reduction potentials are:

- E°(Sn²⁺/Sn) = -0.14 V

- E°(Cu²⁺/Cu) = 0.15 V

Now, we can calculate the standard emf of the cell:

E°cell = E°(cathode) - E°(anode)

E°cell = (0.15 V) - (-0.14 V)

E°cell = 0.15 V + 0.14 V

E°cell = 0.29 V

Therefore, the standard emf of the galvanic cell at 25°C is 0.29 V. This positive value indicates that the cell is capable of producing electrical energy as spontaneous redox reactions occur.