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Thallium (Tl) is a heavy element used in the electronic industry. The reduction reaction for Tl...

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Chemistry

Thallium (Tl) is a heavy element used in the electronicindustry. The reduction reaction for Tl is Tl+ + e- ® Tl and itsexchange current is j0 = 103´[Tl+]1/2 A/m2 when [Tl+] is measuredin mol/dm3.

1) explain why the exchange current has the functional formshown above (hint: look up the derivation of the exchange currentin the notes and introduce a necessary modification).

2) Calculate and plot the redox current density for thisreaction using (a) the Butler-Volmer equation, (b) the linear and(c) the Tafel approximations at overvoltages h between 0 and - 0.2V for Tl+ concentrations of 1 mM and 1M. Determine the potentialranges where one of the two approximations provide the actualcurrent

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