Solved step step with explanation- calculate nernst equations emfquestions

Solved Step by Step With Explanation- Calculate Nernst Equations & EMF

Questions

02) H+/CH4​,CO2​/Pt 

02. What is the electromotive force of the following Daniel cell?

Answer

Part 1: Potential-Determining Equilibria and Nernst Equations

The Nernst equation is used to calculate the half-cell potential (E) based on the activities of the species involved. In this case, the equation is: E = E° - (RT/nF) ln(aCr2O72- / aCr3+ * aH+)

• E is the half-cell potential.

• F is the Faraday constant.

• aCr2O72-, aCr3+, and aH+ are the activities of the respective species.

The Nernst equation for this half-cell is: E = E° - (RT/nF) ln(aCH4 / aCO2 * aH+)

• E is the half-cell potential.

• F is the Faraday constant.

• aCH4, aCO2, and aH+ are the activities of the respective species.

2. [Zn2+] = 0.1M, [Cu2+] = 0.01M

   • In this case, you need to use the Nernst equation to calculate the cell potential: E = E° - (RT/nF)ln([Zn2+] / [Cu2+])

     • n is the number of electrons transferred in the cell reaction.

     • F is the Faraday constant.