For a standard cell made using gold (Au) and gold (III) nitrate, and cobalt and

Question

For a standard cell made using gold (Au) and gold (III) nitrate, and cobalt and cobalt (II) nitrate Calculate the Ecell if the concentration of Au(NO3)3 is 0.27 M and the concentration of Co(NO3)2 is 0.74 M.

Explanation / Answer

There is this nifty little mathematical relationship called the Nernst equation that allows us to deal with the cell potential of nonstandard solutions: E = Eo - RT/nF ln(Q) Write the reaction: 2Au + 3Co(NO3)2 ---> 3Co + 2Au(NO3)3 Q = [Au(NO3)3]^2 / [Co(NO3)2]^3 where [Au(NO3)3] & [Co(NO3)2] are the concentration values which will give u Q. and then putting in earlier equation with standard values will give u answer. Additional info of reaction with E. , Au3+(aq) + 3e- ? Au(s) 1.52 Co2+(aq) + 2e- ? Co(s) -0.277

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