How would you determine the polarity of the cell after each addition of Fe3+ solution
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To determine the polarity of the cell after each addition of Fe3+ solution, you would need to follow these steps:
1. Identify the half-reactions: Determine the half-reactions occurring at the anode (oxidation) and cathode (reduction) of the electrochemical cell. In this case, Fe3+ is being added, so the half-reaction involving Fe3+ will likely occur at one of the electrodes.
2. Write the half-reactions: Write the balanced chemical equations for the half-reactions involved. Make sure to include the correct number of electrons transferred in each half-reaction.
3. Calculate the cell potential: Use the standard reduction potentials (also called standard electrode potentials) to determine the cell potential for each half-reaction. The cell potential is the difference between the reduction potential of the cathode and the oxidation potential of the anode.
4. Determine cell polarity: The cell polarity can be determined by comparing the cell potential with the standard electromotive force (emf) of a cell. If the calculated cell potential is positive (greater than 0), the cell is thermodynamically favorable, and the anode is negative (polarity flows from anode to cathode). If the calculated cell potential is negative (less than 0), the cell is not thermodynamically favorable, and the anode is positive (polarity flows from cathode to anode).
By following these steps after each addition of Fe3+ solution, you can determine the polarity of the cell and track any changes as additional Fe3+ is added.
To determine the polarity of a cell after each addition of Fe3+ solution, you would need to follow these steps:
1. Identify the half-reactions: Determine the oxidation and reduction half-reactions involved in the cell. In this case, Fe3+ will likely be reduced to Fe2+ (reduction half-reaction), while another species in the cell will be oxidized.
2. Determine the standard reduction potentials: Look up the standard reduction potentials for the half-reactions involved. These values can be found in reference tables or online sources.
3. Calculate the cell potential: Subtract the standard reduction potential of the oxidation half-reaction from the standard reduction potential of the reduction half-reaction to obtain the cell potential (E°cell). The reduction half-reaction with the more positive (or less negative) potential will be the reduction half-reaction that occurs.
4. Observe the changes: After each addition of the Fe3+ solution, you can expect changes in the concentrations of the species involved in the cell. These changes will affect the cell potential.
5. Compare the new cell potentials: Use the Nernst equation to calculate the revised cell potential (Ecell) based on the changes in concentration. By comparing the new values of Ecell with the initial E°cell, you can determine if the cell potential has increased or decreased, which indicates the polarity of the cell.
If the new Ecell is more positive or less negative than the initial E°cell, the cell polarity remains the same. If the new Ecell is more negative or less positive than the initial E°cell, the cell polarity has reversed.