Need help with concentration cell problem.
- From: "Michael Andersen" <man052@xxxxxxxxxxxxxx>
- Date: Wed, 27 Apr 2005 17:41:58 +0200
I'd be enourmously grateful if someone could help me with the following
problem:
We have two containers 1 and 2. In 1 we have a 0.01 M Cu++ solution, and in
2 we have an unknown concentration of Cu++.
Furthermore we have a container 3, which is divided in two by a
semipermeable membrane (let's call the two parts 3a and 3b). In 3a there is
a 0.01 M solution of K+, and in 3b there is a 0.1 M solution of K+. The
membrane is permeable to K+, but not to the anions in the solutions. This
gives a difference in potential that is easily calculated with Nernst's
equation (59 mV, where 3a has higher potential).
Now we dip a copper electrode in 1, and connect this to a calomel electrode
which is dipped into 3a. Then another copper electrode is dipped into 2, and
this one is connected to a calomel electrode which is dipped into 3b. The
circuit is completed by a salt bridge between 1 and 2.
The question is, what is the concentration of Cu++ in 2, if there is no
current flowing in the circuit?
The answer is either 1 M or 0.0001 M, but I cannot agree with my teacher who
claimed the answer has 0.0001 M in a lecture today. Can someone check if
this is correct, and if it is explain why?
Sincerely,
Michael
.
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