Consider the following two chemical reactions, which are the reverse of each oth

Question

Consider the following two chemical reactions, which are the reverse of each other.

Zn + Pb2+ Zn2+ + Pb
Zn2+ + Pb Zn + Pb2+

Note that both reactions are written in one direction, rather than as equilibria. Either might occur in the electrochemical cells you will use in the lab.

(a) Predict which of these two reactions will be spontaneous. Use the table of Standard Reduction Potentials in the Lab Manual.

a. Zn + Pb2+ Zn2+ + Pb

b. Zn2+ + Pb Zn + Pb2+    

(b) What is the standard cell potential (E°cell)?
______ V

Explanation / Answer

a)

Zn/Zn^+2 = 0.76v

Pb^+2 / Pb = -0.13

so a. Zn + Pb2+ Zn2+ + Pb is possible

b) E0cell = E0 oxidation + E0reduction

E0cell = 0.76 - 0.13 = 0.63v

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