What is the Cell Potential for Mg/Mg^2+ and Fe/Fe^2+ Electrodes?

  • Thread starter Thread starter MarcZZ
  • Start date Start date
  • Tags Tags
    Cell Potential
Click For Summary
SUMMARY

The cell potential (ECell) for an electrochemical cell with Mg/Mg2+ and Fe/Fe2+ electrodes, both at 1.00 M concentration, is calculated using the formula ECell = EReduction + EOxidation. The standard reduction potentials are -0.45 V for Fe2+/Fe and -2.37 V for Mg2+/Mg. The correct calculation yields an ECell of 1.92 V, confirming that the answer is option b) 1.92.

PREREQUISITES
  • Understanding of electrochemical cells
  • Knowledge of standard reduction potentials
  • Familiarity with the Nernst equation
  • Basic skills in electrochemistry calculations
NEXT STEPS
  • Study the Nernst equation for non-standard conditions
  • Learn about the significance of standard reduction potentials
  • Explore the concept of half-cell reactions in electrochemistry
  • Investigate the applications of electrochemical cells in real-world scenarios
USEFUL FOR

Chemistry students, educators, and professionals in electrochemistry or materials science who are involved in calculating cell potentials and understanding electrochemical reactions.

MarcZZ
Messages
41
Reaction score
0

Homework Statement



Calculate the cell potential (ECell) of an electrochemical cell with Mg/Mg^2+, and Fe/Fe^2+ electrodes. [Mg^2+] and [Fe^2+] = 1.00 M.

Fe^2+(aq) + 2e^- --> Fe(s) = -0.45V
Mg^2+(aq) + 2e^- --> Mg(s) = -2.37 V

a) 1.90
b) 1.92
c) 1.94
d) 2.82
e) 2.80


Homework Equations



ECell = EReduction + EOxidation

The Attempt at a Solution



I believe the answer is B as I believe because the Mg having a lower value of V will have it's sign changed to form a positive value (oxidation). Is this correct?
 
Physics news on Phys.org
It is not about changing a sign. It is a about a distance between the half cell potentials - mark them on the number axis and it will be obvious.

Doesn't mean your answer is incorrect.
 

Similar threads

Chemistry "The oxidized species of the couple is very oxidizing". Does this make sense?
  • · Replies 5 ·
Replies
5
Views
1K
Chemistry What does this equation for an electrochemical cell mean?
  • · Replies 4 ·
Replies
4
Views
2K
Chemistry How to find the pH of a galvanic cell (MIT OCW problem set)
  • · Replies 2 ·
Replies
2
Views
4K
Chemistry How to apply Nernst equation in this problem?
  • · Replies 3 ·
Replies
3
Views
2K
Galvanic Cell Reactions and Potential Calculation
  • · Replies 4 ·
Replies
4
Views
12K
Calculate Cell Potential at 25°C for Fe & Pd Cells
  • · Replies 1 ·
Replies
1
Views
3K
Determining the potential in a cell that is not at equilibrium concentrations.
  • · Replies 1 ·
Replies
1
Views
3K
What Is the Potential When Fe^(2+) Changes by .393 M?
  • · Replies 1 ·
Replies
1
Views
3K
Calculating ξ° value for a galvanic cell
  • · Replies 1 ·
Replies
1
Views
3K
Potential across a battery cell change ion concentrations and electron flow
  • · Replies 4 ·
Replies
4
Views
2K