Concentration Cell

 

 

Chemicals and Solutions: 

1 Molar Copper Sulfate solution

10 millimolar Copper Sulfate solution

Two copper strips, each in a metal holder

Materials: 

Two 400 mL beakers

Salt bridge

Digital Voltmeter

Alligator clips

Procedure: 

Fill one beaker half full with 1M copper sulfate solution and place one of the copper strips in the solution.  Fill the other beaker half full with a 10 millimolar solution of copper sulfate and place another copper strip in this solution.  Connect the copper strips to the digital voltmeter and then complete the circuit by inserting a salt bridge. 

Hint: 

Discussion: 

The potential of a concentration cell is given by the Nerst equation:

The 1 millimolar compartment is the anode:

Cu (s) ---> Cu2+(aq) + 2e-

and the 1 M compartment is the cathode

Cu2+(aq)  + 2e- ---> Cu (s)

For a concentration cell Eo is zero because both compartments are identical.  For the copper concentration cell, the number of electrons tranferred per copper atom is 2, so n=2. 

 

 

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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