Which of the following is NOT a difficulty in setting SHE?
Which of the following is NOT a difficulty in setting SHE?
To obtain pure hydrogen gas
To obtain dry hydrogen gas
To maintain exactly 1 atm pressure
To bring the reaction in reverse direction
Solution
In standard hydrogen electrode (SHE), a platinum plate coated with platinum black is used as electrode. The platinum black is capable of adsorbing large quantities of $\mathrm{H}_2$ gas. This allows the change from gaseous to ionic form and the reverse process to occur.