Q2. What is the effect of the blocking effect on the reaction rate?
At low concentrations of the hydroxides, especially for the small tetra-methyl and ethyl ammonium ions the Frumkin effect is predominant, resulting in an increase of the reaction rate.
Q3. Why did the r-type reactant adsorb so much?
Up to now, all systems with specific adsorption of reactants were found to proceed reversibly (iz large), perhaps because the reactants interact strongly with the electrode in the adsorption process and approach the surface closely, so that the activation energy for the charge transfer process is lowered to such a degree, that it is no longer rate determining.
Q4. What are the complications involved in a simple electrode process?
Oncethe complications involved in a simple electrode process at a simple electrode surface, for example the potential-dependency of the rate constant, are understood completely, other complicating factors, such as surface roughness, dislocations, heterogeneity of the electrode surface, surface films, porosity, may be better understood.
Q5. What is the effect of the blocking effect on the discharge of zinc ion in magnesium per?
3. Inlluence of coverage on the apparent exchange current for the discharge of 2 mM zinc ion in 0.125 M magnesium perchlorate on 0.046 M zinc-amalgam at 25°C.
Q6. What is the consequence of the experimentally determined transfer coefficients?
The consequence is that the experimentally determined transfer coefficients principally contain a term due to the potential dependency of the rate constant.
Q7. What is the q’ function in eq. 3?
6. This result suggests that the free energy of activation of the charge transfer step, AGo’ in eq. (3), is a linear function of the specifically adsorbed amount of iodide ions (cf. ref. 20).
Q8. What is the effect of the double layer on the kinetics of the elec-?
The potential differences in the double layer influence the kinetics of theelectrode reaction in two ways15 2):(a) Instead of the concentrations at the electrode surface, Co and CR,the concentrations at the O.W.P. must be taken.
Q9. What is the rate of the reaction at the covered parts of the electrode?
the rate of the electrode reaction at the covered parts of the electrode is4X-:;1inhibition acceleration-3 -2 -1 0log =Alk,NOH (C in mole L-0Fig.
Q10. What is the way to interpret the change in rate constant with coverage of the surface?
A possible way of interpreting the change in rate constant with coverage of the surface is to treat the adsorbate as a layer of dipoleG7).
Q11. What is the difference between the rate constant and the rate of charge transfer?
Varying the O/R ratio means varying the mean electrode potential and, as the specifically adsorbed amount of the anions of the supporting electrolyte is a function of potential, it can be expected that the apparent rate constant is potential dependent too, if indeed the rate of charge transfer is correlated withELECTRODE KINETICS AND DOUBLE LAYER STRUCTURE 53specific anion adsorption.
Q12. What is the transfer coefficient of cadmium in aprotic solvent?
The transfer coefficients are constant over a wide range of amalgam and electrolyte concentrations, the same holds for the stoichiometric number.