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Homework Statement
A voitaic cell consists of a Zn/Zn^2+ half-cell and Ni/Ni^2+ half-cell at 25C. The initial concentration of Ni^2+ and Zn^2+ are 1.50M and .100M respectively.
What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45V?
Homework Equations
Ecell = Ecell(standard) - (0.0592V/n)logK
The Attempt at a Solution
I got the correct answer, but I'm not clear on the method used to solve this problem.
When I used the Nernst equation, I got a ratio of 504 = ([Zn2+]/[Ni2+])
Why would I divide 1.50M Ni2+ by 504 to get the concentration of Zn2+ at 45V?