Question

Standard hydrogen electrode has an arbitrarily fixed potential
(a) 0.00 volt
(b) 1.00 volt
(c) 0.10 volt
(d) none of these
​

Answer 1

Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E°) is declared to be zero volts at any temperature.

Answer 2

Answer:

The standard hydrogen electrode has an arbitrarily fixed potential (a) of 0.00volt.

Concept:

The typical hydrogen electrode served as the industry standard for zero potential in the early days of electrochemistry.

Explanation:

The fact that it could be made by "[immersing] a platinum electrode into a solution of 1 N strong acid and [bubbling] hydrogen gas through the solution at approximately 1 atm pressure" was convenient. This electrode/solution interface, though, was modified afterward. It was replaced by a theoretical electrode/solution interface where the H+ concentration was 1 M, but it was assumed that there was no interaction between the H+ ions and other ions (a condition not physically attainable at those concentrations). The term "Standard Hydrogen Electrode" was used to distinguish this new standard from the previous one. The term RHE (Reversible Hydrogen Electrode) also refers to a useful hydrogen electrode whose potential is affected by the pH of the solution.

#SPJ3