A cell is constructed by immersing a strip of lead in a 1.0M Pb(NO 3 ) 2 solutio

Question

A cell is constructed by immersing a strip of lead in a 1.0M Pb(NO3)2 solution and a strip of silver in a 1.0M AgNO3 solution. The circuit is completed by a wire and a salt bridge. As the cell operates, the strip of silver gains mass and the concentration of the silver ions in the solution around the silver strip decreases, while the strip of lead loses mass and the concentration of the lead ions increases in the solution around the lead strip. Which of the following represents the reaction that occurs at the cathode in this cell?

Explanation / Answer

Reduction (gain of electrons) occurs at the cathode:

Ag+(aq) + e- => Ag(s)


(Note that the Ag cathode gains mass and the Ag+ ion concentration decreases as Ag+ is reduced to Ag)

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