Electrochemistry: Galvanic Cells and the Nernst Equation
Step 4: Practice with cells in non-standard conditions
Please use the feedback form to answer the following questions which will be turned in to your TA.
Activity: Determine the effects of changing half-cell concentration on cell potential. Use the simulation below to explore the effects of changing half-cell concentrations and to answer the following questions.
Dilute the Sn2+ solution in the following two galvanic cells. What happens to the voltage in each? Explain your results.
Reaction 1: Sn(s) + Cu2+(aq) --> Sn2+(aq) + Cu(s)
Reaction 2: Zn(s) + Sn2+(aq) --> Zn2+(aq) + Sn(s)
Consider a cell: Zn(s) + Cu2+(aq) --> Zn2+(aq) + Cu(s) in which the concentration of [Cu2+] and [Zn2+] are both 2M.
[Note that the simulation does not provide solutions above 1M. Please make predictions about cells with 2M concentrations based upon experiments you perform with the concentrations provided.]
Will the cell potential be greater than, equal to or less than the standard cell potential?
Will the cell be able to run the stopwatch for a longer time, equal time, or shorter time than the standard cell?
This concludes the electrochemistry activity, please be sure to complete the activity form.