Consider a generic redox reaction?

Consider a generic redox reaction X (s) + Y^ + (aq) X^ + (aq) + Y (s) then suppose that the coefficients in the redox reaction are doubled. How will the following quantities be affected for a voltaic cell under nonstandard conditions? 1. Doubled 2. Halved 3. Squared 4. No Change The options are InQ, E^o, E, n, Q

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Chemistry

Laila Sexton

4 November, 11:38

Consider a generic redox reaction?

Consider a generic redox reaction X (s) + Y^ + (aq) X^ + (aq) + Y (s) then suppose that the coefficients in the redox reaction are doubled. How will the following quantities be affected for a voltaic cell under nonstandard conditions? 1. Doubled 2. Halved 3. Squared 4. No Change The options are InQ, E^o, E, n, Q

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Judith Rivas · Answer 1

The Nernst equation allows us to predict the cell potential for voltaic cells under conditions other than the standard conditions of 1M, 1 atm, 25°C. The effects of different temperatures and concentrations may be tracked in terms of the Gibbs energy change ΔG. This free energy change depends upon the temperature & concentrations according to ΔG = ΔG° + RTInQ where ΔG° is the free energy change under conditions and Q is the thermodynamic reaction quotient. The free energy change is related to the cell potential Ecell by ΔG = nFEcell

so for non-standard conditions

-nFEcell = - nFE°cell + RT InQ

or

Ecell = E°cell - RT/nF (InQ)

which is called Nernst equation.