KVPY2016ChemistryElectrochemistry
Given the standard potentials E ^ ( Cu ²⁺ / Cu ) and E ^ ( Cu ⁺ / Cu ) as 0.340 ~V and 0.522 ~V respectively, the value of E ^ ( Cu ²⁺ / Cu ⁺ ) is
Options
- A0.364 ~V
- B0.158 ~V
- C-0.182 ~V
- D-0.316 ~V
Correct answer
B. 0.158 ~V
Step-by-step solution
Cu ⁺²+2 e ⁻ Cu G ₁^ =- n ₁ E ₁^ F Cu +2 + e ⁻ Cu G ₂^ =- n ₂ E ₂^ F Cu ⁺²+ e ⁻ Cu ⁺ G ₃^ =- n ₃ E ₃^ F G ₃^ = G ₁^ - G ₂^ - n ₃ E ₃^ F =- n ₁ E ₁^ F + n ₂ E ₂^ F E ₃^ = n ₁ E ₁^ - n ₂ E ₂^ n ₃ = 2 0.34-.522 1 =.158 ~V