Mass transport limited currents are usually measured when the potential is appro
ID: 633717 • Letter: M
Question
Mass transport limited currents are usually measured when the potential is approximately 100 mV more positive (for oxidation) than the reversible potential as determined from the Nernst equation. For reductions, the potential has to be 0.100 V more reductive (i.e. negative).
Using the Nernst equation for a general redox reaction Ox + e- = Red, with a Eo = 0.686 V, determine the minimum potential (in V) where mass transport limited current could be realized for an oxidation. The concentrations of the reactants are: Ox = 2.85 mM, Red = 5.13 mM.
If needed, you may assume standard temperature.
show your calculation plz.
Explanation / Answer
E = Eo-(0.059)/n log[reduced]/[oxidised], here n= no of electrons involved in redox process=1,
E = 0.686 -(0.059/1) log[ 5.13/2.85) ,
E = 0.4307