A voltaic cell is constructed with two silver- silver chloride electrodes, where the half- reaction is The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively.
The cell emf is V.

Question

A voltaic cell is constructed with two silver- silver chloride electrodes, where the half- reaction is  The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively.
The cell emf is V.

Quizplus · Accepted Answer

The cell potential (emf) can be calculated using the Nernst equation:

E = E° - (RT/nF) * ln(Q)

where E° is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred in the half-reaction, F is the Faraday constant, and Q is the reaction quotient.

For the given half-reaction, the standard cell potential is 0.222 V (taken from a standard reduction potential table). The reaction quotient can be expressed as:

Q = [AgCl]2 / [AgCl]1

where [AgCl]1 and [AgCl]2 are the concentrations of AgCl in the two compartments.

Substituting the given values into the Nernst equation, we get:

E = 0.222 V - (0.0257 V/K) * ln(0.0222/2.22)

E = 0.118 V

Therefore, the best choice is C.

A Voltaic Cell Is Constructed with Two Silver- Silver Chloride