Problem: Heart pacemakers are often powered by lithium-silver chromate "button" batteries. The overall cell reaction is:2Li(s) + Ag2CrO4(s)  →  Li2CrO4(s) + 2Ag(s)Lithium metal is the reactant at one of the electrodes of the battery. Is it the anode or the cathode?

FREE Expert Solution

We’re being asked to determine if the lithium metal is an anode or cathode in the following cell reaction:

2 Li(s) + Ag2CrO4(s) → Li2CrO4(s) + 2 Ag(s)


To do so, we need to identify the change in oxidation state for Lithium in the reaction. 


Recall:

Lose               Gain
Electron         Electrons
Oxidation       Reduction

cathode reduction  oxidation number decreases

anode  oxidation  oxidation number increases

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Problem Details

Heart pacemakers are often powered by lithium-silver chromate "button" batteries. The overall cell reaction is:
2Li(s) + Ag2CrO4(s)  →  Li2CrO4(s) + 2Ag(s)

Lithium metal is the reactant at one of the electrodes of the battery. Is it the anode or the cathode?