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The following reaction occurs at the anode of an electrochemical cell:Zn(s) ? Zn2+ (aq)

Chapter 16, Problem 87P

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QUESTION:

Problem 87P

The following reaction occurs at the anode of an electrochemical cell:

Zn(s) → Zn2+ (aq) + 2e−

Which cathode reaction would produce a battery with the highest voltage?

(a) Mg2+(aq) + 2e− → Mg(s)

(b) Pb2+ (aq) + 2e− → Pb(s)

(c) Cr3+ (aq) + 3e− → Cr(s)

(a) Cu2+ (aq) + 2e− → Cu(s)

Questions & Answers

QUESTION:

Problem 87P

The following reaction occurs at the anode of an electrochemical cell:

Zn(s) → Zn2+ (aq) + 2e−

Which cathode reaction would produce a battery with the highest voltage?

(a) Mg2+(aq) + 2e− → Mg(s)

(b) Pb2+ (aq) + 2e− → Pb(s)

(c) Cr3+ (aq) + 3e− → Cr(s)

(a) Cu2+ (aq) + 2e− → Cu(s)

ANSWER:

Solution: Here, we are going to identify the cathode reaction producing a battery with the highest voltage with the given anode reaction.

Step1:

Electrochemical cells are the devices which converts chemical energy to electrical energy.

Voltage can be calculated by the following relation:

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