
Concept explainers
(a)
Interpretation:
The EMF of given voltaic cell should be calculated by using standard free energy changes of reactants and products.
Concept introduction:
Free energy change:
In
ΔG = -nFEcell
Where,
ΔG is free energy changen is number of electron transferredF is faraday constantEcell is cell potential
Free energy change:
The free energy change of a reaction is given by the subtraction of free energy changes of reactants from free energy changes of reactants.
ΔG =∑nΔGf° (products)-∑mΔGf° (reactants)
(b)
Interpretation:
Equilibrium constant of given reaction should be calculated.
Concept introduction:
Equilibrium constant Kc:
The relationship between equilibrium constant and cell potential (EMF) is given by below equation
Ecell= 0.0592nFlog Kc
Where,
Kc is equilibrium constantn is number of electron transferredF is faraday constantEcell is cell potential
(c)
Interpretation:
The effect of concentration of Fe2+(aq) ion on equilibrium constant should be explained.
Equilibrium constant Kc:
The relationship between equilibrium constant and cell potential (EMF) is given by below equation
Ecell= 0.0592nFlog Kc
Where,
Kc is equilibrium constantn is number of electron transferredF is faraday constantEcell is cell potential

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Chapter 19 Solutions
General Chemistry
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