Consider an Electrochemical Cell Involving the Overall Reaction 2AgBr(s) $\rarr$ Pb²⁺ + 2Ag(s) + 2Br^-

Consider an electrochemical cell involving the overall reaction 2AgBr(s) + Pb(s) $\rarr$ Pb²⁺ + 2Ag(s) + 2Br^-.Each half-reaction is carried out in a separate compartment. The anion included in the lead half-cell is NO₃^-. The cation in the silver half-cell is K⁺. The two half-cells are connected by a KNO₃ salt bridge. If [Pb²⁺] = 1.0 M, what concentration of Br^- ion will produce a cell emf of 0.25 V at 298 K
Given: AgBr(s) + e^- $\rarr$ Ag + Br^-, E ^$\circ$ = +0.07 V.

A) 0.02 M
B) 0.14 M
C) 0.38 M
D) 1.0 M
E) 7.0 M

Correct Answer:

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