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Topic: Electrochemistry (galvanic cell)  (Read 9199 times)

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Offline schan1

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Electrochemistry (galvanic cell)
« on: April 11, 2006, 11:44:21 AM »
a chem question...

A galvanic cell is constructed with a silver-silver chloride electrode, and a nickel strip immersed in a beaker containing 1.45x 10-2 M solution of NiCl2. Determine the balanced cell reaction and calculate the potential of the cell. Enter in volts. (assume a temperature of 25oC)

I know I need to use the nernst equation
E = E0cell - 0.592/n log (Q)
But i don't understand how I can get Q. Do I need the concentration of silver in order to calculate Q?
The balanced equation is:
2Ag+ (aq) + Ni (s) ---> Ni2+ (aq) + 2 Ag (s)
so i think Q = [Ni2+]/[Ag+]^2  ???

Offline Borek

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Re: Electrochemistry (galvanic cell)
« Reply #1 on: April 11, 2006, 03:19:44 PM »
Ag/AgCl cell potential depends on Cl- concentration, not Ag+.
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Offline schan1

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Re: Electrochemistry (galvanic cell)
« Reply #2 on: April 11, 2006, 05:24:21 PM »
I know how to solve it now.  :)
I used Ksp for AgCl to solve for the concentration of Ag+, then plug in everything in the Enernst equation, and I got the right answer. So, you have another appoach to this problem?

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