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The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is :

1. 10^-14 atm
2. 10^-12 atm
3. 10^-10 atm
4. 10^-4 atm

Correct answer: 10^-14 atm

Solution

For the hydrogen electrode to have zero potential, the concentration of H+ ions must equal 10^-7 M (neutral water at 298 K). Using the Nernst equation, the required pressure of H2 is calculated as 10^-14 atm.

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