For the half-reaction AgCl ( s ) + e − ⇌ Ag ( s ) + Cl − ( aq ) , which of the following expressions correctly relate the standard potential ( E AgCl / Ag ∘ ) to other thermodynamic constants?

Question

For the half-reaction AgCl ( s ) + e − ⇌ Ag ( s ) + Cl − ( aq ) , which of the following expressions correctly relate the standard potential ( E AgCl / Ag ∘ ​ ) to other thermodynamic constants?

TestHub · Accepted Answer

Explain the question: Relate E ∘ to thermodynamic constants. Concept: Gibbs Free Energy and Ksp relations. Solution: The standard potential E A g Cl / A g ∘ ​ is linked to thermodynamics through several key expressions. Option (A): By combining the reactions AgCl(s) ⇌ Ag⁺ + Cl⁻ ( Δ G ∘ = − RT ln K s p ​ ) and Ag⁺ + e⁻ ⇌ Ag(s) ( Δ G ∘ = − n F E A g + / A g ∘ ​ ), the resulting potential is E A g Cl / A g ∘ ​ = E A g + / A g ∘ ​ + F RT ​ ln K s p ​ . Since K s p ​ < 1 , the log term is negative, making E A g Cl / A g ∘ ​ (0.222 V) less than E A g + / A g ∘ ​ (0.7999 V), which disproves (C). Option (B): Follows the fundamental relation Δ G ∘ = − n F E ∘ , where n = 1 . Option (D): Potential is an intensive property; as long as the solid AgCl is present to maintain saturation, its exact mass does not affect the voltage.

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Options:(select one or more)

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