Download Chemistry Worksheet NAME: _____________________________ Galvanic Cell Concepts and Calculations

Chemistry Worksheet
Galvanic Cell Concepts and Calculations
NAME: _____________________________
Block: _________
1. Consider the following galvanic cell at 25 oC:
Fe(s)|Fe2+ (0.10 M)||Cu+ (0.10 M)|Cu(s)
a. Write the half-equations and the overall chemical equation for the cell as diagrammed.
b. What would be the standard potential (o) of this cell?
c. What would be the voltage () of this cell?
d. Calculate the equilibrium constant for the overall cell reaction.
e. Identify the positive and negative electrodes of the galvanic cell.
f. Describe the direction of the flow of anions (e.g., SO42–) through the salt bridge.
g. Describe the direction of the flow of electrons in the external circuit.
h. One version of the cell is constructed with 2.0 mol each of Fe(s) and Cu(s) as the
electrodes; the volumes of the electrolyte solutions are sufficiently large so that the
concentrations of the ionic species remain essentially constant. If the cell is to provide
0.50 A of continuous current, for how many days would the cell operate before it dies.
[Hint: First, identify the limiting reagent. Note that there are 86,400 seconds in one day.]
i.
Another version of the cell is constructed with the electrolyte solutions each with a
volume of 1.0 L; the masses of the electrodes are sufficiently large so that the remain
essentially constant. Determine the values of [Fe2+] and [Cu+] when the cell has reached
equilibrium. [Hint: Remember the step-wise strategy for solving equilibrium problems.
Note the magnitude of Keq from part d.]