Stranded on a desert island you need to charge your phone so you can update your

Question

Stranded on a desert island you need to charge your phone so you can update your Facebook status. You have found some scraps of material (and a salt bridge!) and are attempting to produce a galvanic cell. Using Pb and Al metals as the electrodes and acidic solutions of Pb2+ and Al3+, provide the following information to describe your 4. (a) balanced overall chemical equation (b) cell potential (use standard reduction tables from the following table) (c) indicate which reaction is the anode and which is the cathode

Explanation / Answer

2Al(s) ------------------------> 2Al^3+ (aq) + 6e^-     E0 = 1.66v    ( oxidation half reaction)

3Pb^2+ (aq) + 6e^- -----------> 3Pb(s)               E0 = -0.13v    ( reduction half reaction)

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2Al(s) + 3Pb^2+ (aq) ---------------> 2Al^3+ (aq) + 3Pb(s) E0cell = 1.53v    over all cell reaction

Al is anode .

Pb is cathode

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