KVPY2011ChemistryElectrochemistry
If E_ Fe ²⁺ / Fe ^ =-0.440 ~V and E _ Fe ³⁺ / Fe ²⁺ ^ =0.770 ~V , then E _ Fe ³⁺ / Fe ^ o is-
Options
- A0.330 ~V
- B-0.037 ~V
- C-0.330 ~V
- D-1.210 ~V
Correct answer
B. -0.037 ~V
Step-by-step solution
Fe ⁺³ / Fe Fe ⁺²+2 e ⁻ Fe E ⁰=-0.44 Fe ⁺³+ e ⁻ Fe ⁺² E ⁰=0.770 Fe ⁺³+3 e ⁻ Fe E ⁰=? E ⁰= n ₁ E ₁⁰+ n ₂ E ₂⁰ n ₃ = 2(-0.44)+1 (0.770) 3 = -0.88+0.770 3 =-0.037 volt