Discussion
The standard electrode potential of an electrode is measured with the ion at
Answer: D
Correct answer: unit activity and 25 degrees Celsius
The standard state is unit activity for every species involved, one atmosphere for any gas, and a stated temperature of 25 degrees. All tabulated standard electrode potentials are measured against the standard hydrogen electrode under those conditions, which is what makes them comparable. Away from unit activity the potential must be corrected by the Nernst equation.
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