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What will be the potential of a cell constructed of a standard hydrogen electrode as one half-cell and a silver wire coated with AgBr dipping into 0.13 M HBr as the other half-cell?

The value of Ksp for AgBr is 5.4 × 10-13.

For the Ag/AgBr electrode,
AgBr(s) + e- ---> Ag(s) + Br-(aq) E°AgBr = +0.070 V

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