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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: zeshkani on November 14, 2007, 02:30:29 AM

Title: Potential & Nernst Equation
Post by: zeshkani on November 14, 2007, 02:30:29 AM

Consider a simple metal ion, Mn+, such that Mn+ + e <---> M^(n-1)+ at E^oM . The complexation of Mn⁺ and M^(n-1)+ with x ligands, L, have the following formation constants: Mn⁺ + x L  <---> MLn⁺_x for betax;n
andM(n-1)⁺ +x L <---> ML^(n-1)+_x for beta_x;n-1. The standard potential for the resulting complex, E^oM L , applies to MLn⁺ x + e <---> ML^(n-1)+_x .
The relative magnitude of the formation constants determine whether E^oM or
E^oM L is greater and whether the complexed species is easier or harder to reduce than the free metal ion.

(a) Find the potential and write the Nernst equation for FeLⁿ⁺_x + Fe²⁺<--> FeL^(n-1)+_x + Fe^3+.

this problem is so confusing , i just dont know even what to do ???