Zinc can displace lead ions from solution in the following manner: Zn(s) + Pb2+?

Question

Zinc can displace lead ions from solution in the following manner:

Zn(s) + Pb2+?(aq) ? Zn2+?(aq) + Pb(s)

In an expanded redox activity series, the reaction of Pb2+?(aq) + 2e? ? Pb(s) is located below the reaction of Zn2+?(aq) + 2e? ? Zn(s).
Which of the following best explains why this reaction is spontaneous or nonspontaneous?



a)The reaction is spontaneous because zinc is a better reducing agent than lead.
b)The reaction is spontaneous because zinc is a better oxidizing agent than lead.
c)The reaction is nonspontaneous because lead is a better reducing agent than zinc.
d)The reaction is nonspontaneous because lead is a better oxidizing agent than zinc.

Explanation / Answer

Zn loses electrons; therefore it is oxidized and functions as the reducing agent. This rules out 2 and 3. Because Zn is above Pb, the reaction is spontaneous in the given direction, ruling out 4. That leaves the first one.

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