December 11, 2019, 09:14:42 AM
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Topic: Help please - lab due today - Impact on VOLTAGE when diluting anode solution  (Read 6640 times)

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Offline daveh

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So I did an experiment with the following cell: Zn(s) | Zn+2 (aq, .5M) || Cu (s) | Cu+2 (aq, .5M) When I diluted the cathode solution (Cu+2) to 0.005M, I saw a slight drop in the measured voltage (1.080V undiluted, 1.030V diluted cathode). Is this what is supposed to happen?

What would happen to the measured voltage specifically if the anode solution (Zn+2) was diluted instead? And why?

I've been searching the web for days until I ran into a similar but different discussion in this thread here: http://www.chemicalforums.com/index.php?topic=31631.0

The other thread talks about molar conductivity being related to electrolyte concentration. However, I'm not sure how conductivity (units S/m) would relate to voltage exactly, so the other thread isn't of much help.
« Last Edit: November 04, 2009, 07:11:54 AM by daveh »

Offline Borek

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You have not heard about Nernst equation?
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Offline daveh

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You have not heard about Nernst equation?

Aaaah okay, I understand. You're a lifesaver. And no, we haven't talked about the nernst equation yet in class.

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