What pressure (bar) of would be required to make emf of hydrogen electrode zero in pure water at ?

Question

What pressure (bar) of  would be required to make emf of hydrogen electrode zero in pure water at ?

Canvas Classes · Accepted Answer

Strategy:
 Use the Nernst Equation for a hydrogen electrode. For the potential to be zero in pure water, the concentration of  (calculated from the auto-ionization of water) must be balanced by a specific pressure of .

Step 1: Conditions for pure water
At , .

Step 2: Apply Nernst Equation
 (Target). Reaction: .

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