Question

2. The following reaction takes place in a galvanic cell: 2Al(s) + 3Cu² (aq) → 2Al(aq) + 2Cu(s)

Answer 1

The  standard cell potential is obtained from the equation of the reaction.

What is the  standard cell potential?

The  standard cell potential is obtained from the equation of the reaction. Now we have the overall cell equation as from the half reactions as;

Oxidation half reaction;

Al(s) --->Al³+ (aq) + 3 e

Reduction half equation;

Cu²+ (aq) + 2 e →→ Cu(s)

Standard cell potential Eºcell = 0.34V - (-1.66 V) = 2 V

Now;

ΔG = -nFEcell

ΔG = -(2 * 6 * 96500 * 2)

ΔG = -2316kJ

E = 2 - 0.0592/6 log [0.0025]/[3.5 M]

E = 2 + 0.031

E = 2.031 V

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