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Ch.20 - Electrochemistry
Tro - Chemistry: A Molecular Approach 5th Edition
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Tutti i libri di testoTro 5th EditionCh.20 - ElectrochemistryProblema 80c
Capitolo 20, Problema 80c

Consider the concentration cell:
Diagram of a galvanic cell showing nickel electrodes and Pb2+ concentrations.
c. Indicate what happens to the concentration of Pb2+ in each half-cell.

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Identify the anode and cathode in the concentration cell. In this case, the anode is the half-cell with the lower concentration of Ni2+ (0.52 M), and the cathode is the half-cell with the higher concentration of Ni2+ (2.0 M).
Understand that in a concentration cell, electrons flow from the anode to the cathode. This means that oxidation occurs at the anode and reduction occurs at the cathode.
At the anode, Ni(s) is oxidized to Ni2+(aq), increasing the concentration of Ni2+ in the anode half-cell.
At the cathode, Ni2+(aq) is reduced to Ni(s), decreasing the concentration of Ni2+ in the cathode half-cell.
Summarize the changes: The concentration of Ni2+ in the anode half-cell will increase, while the concentration of Ni2+ in the cathode half-cell will decrease.

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Concentration Cell

A concentration cell is a type of galvanic cell where the electrodes are made of the same material but are immersed in solutions of different concentrations. The potential difference arises from the concentration gradient, driving the spontaneous flow of electrons from the anode (lower concentration) to the cathode (higher concentration). This process continues until the concentrations equalize, demonstrating the relationship between chemical potential and concentration.
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The Electrolytic Cell

Nernst Equation

The Nernst equation relates the cell potential to the concentrations of the reactants and products in an electrochemical cell. It is expressed as E = E° - (RT/nF) ln(Q), where E is the cell potential, E° is the standard cell potential, R is the gas constant, T is the temperature in Kelvin, n is the number of moles of electrons transferred, F is Faraday's constant, and Q is the reaction quotient. This equation helps predict how changes in concentration affect the cell's voltage.
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The Nernst Equation

Electrode Reactions

In a concentration cell, the electrode reactions involve the oxidation and reduction of the same species at different concentrations. At the anode, the species in lower concentration loses electrons (oxidation), while at the cathode, the species in higher concentration gains electrons (reduction). This transfer of electrons is what generates electrical energy, and the concentration of the ions in each half-cell will change as the cell operates, with the anode's concentration decreasing and the cathode's concentration increasing.
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Electron Capture & Positron Emission Reaction Example
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