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.
cathode→ reduction → oxidation number decreases
anode → oxidation → oxidation number increases
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?