Question

Consider the standard reduction potentials of the following half reactions. Eored = (Ni2+ / Ni; -0.28 V), (Cu2+ / Cu; +0...


Consider the standard reduction potentials of the following half reactions. Eored = (Ni2+ / Ni; -0.28 V), (Cu2+ / Cu; +0.34 V), (Ag+ / Ag; +0.80 V), (Al3+ / Al; -1.66 V) Choose the best combination of these half-cell reactions that gives the largest cell potential for a Voltaic cell. Which ones would be the anot and the cathod? For this cell, write the overall cell reaction and calculate the Eocell.

Answer

Given information,

Eored = (Ni2+ / Ni; -0.28 V), (Cu2+ / Cu; +0.34 V), (Ag+ / Ag; +0.80 V), (Al3+ / Al; -1.66 V) 

More positive standard reduction potential containing half-cell will act as a cathode. More negative standard reduction potential containing half-cell will act as a anode.

Therefore, Ag+/Ag couple acts as a cathode (reduction) and Al/Al3+ acts as an anode (oxidation).

Overall cell reaction,

         Chemistry homework question answer, step 2, image 1

Calculate Ecell of the reaction with maximum cell potential,

                Chemistry homework question answer, step 2, image 2

 

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