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A concentration cell is constructed using two Ag-AgBr electrodes, each of which is based on the...

A concentration cell is constructed using two Ag-AgBr electrodes, each of which is based on the half-reaction:

AgBr(s) + e ⇌Ag(s) + Br (aq), E° = 0.070 V. If the anode half-cell contains 0.050 M Br and the cell has an initial potential of 0.090 V at 25°C, what is the concentration of Br− in the cathode?

The answer is .0015M please explain why this is correct and how to solve

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