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The mean activity coefficients of HBrin 5.0 and 20.0 mmol kg

–1 are 0.930 and 0.879,
respectively. Consider a hydrogen electrode in HBr(aq) solution at 25 °C operating at
1.15 atm.
Calculate the change in the electrode potential when the molality of the acid solution
is changed from 5.0 and 20.0 mmol kg
–1
.

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