
a) Draw Labelled diagram of Standard Hydrogen Electrode (SHE). Write its half-cell reaction of value.
b) Calculate for the following reaction:
, (Given )
Answer
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Hint: The Standard Hydrogen Electrode, is a redox electrode which is the basic of the thermodynamic scale of oxidation-reduction potential. It is basically used as a reference electrode on half-cell potential reactions. The value of the standard electrode potential is zero, which forms the basis to calculate cell potentials using different electrodes or different concentrations.
Complete answer:
The Standard Hydrogen Electrode also known as SHE. The potential of SHE is always 0 at 298K, this is the reason it is used as a reference electrode.
The redox half-cell reaction of the SHE is:
Hydrogen Standard electrode potential ( ) is declared as zero at any temperature.
Addition Information:
The absolute electrode potential of SHE is measured to be 4.44+-0.02V at room temperature. But for a basic comparison with all other electrode reactions, Hydrogen standard electrode potential ( ) is declared to be zero volts at any temperature.
The reasons for choice for platinum for the hydrogen electrode is:
-Inertness of platinum
-The capability of platinum to catalyze the reaction of proton reduction
-Use a surface material that absorbs hydrogen well at its interface. This increases the reaction kinetics
Note:
The value of standard electrode potential is always zero. During the reaction, hydrogen gas is passed through and into the solution and the reaction that takes place is:
b) Calculate for the following reaction:
, (Given )
Complete answer:
The Standard Hydrogen Electrode also known as SHE. The potential of SHE is always 0 at 298K, this is the reason it is used as a reference electrode.
The redox half-cell reaction of the SHE is:
Hydrogen Standard electrode potential (

Addition Information:
The absolute electrode potential of SHE is measured to be 4.44+-0.02V at room temperature. But for a basic comparison with all other electrode reactions, Hydrogen standard electrode potential (
The reasons for choice for platinum for the hydrogen electrode is:
-Inertness of platinum
-The capability of platinum to catalyze the reaction of proton reduction
-Use a surface material that absorbs hydrogen well at its interface. This increases the reaction kinetics
Note:
The value of standard electrode potential is always zero. During the reaction, hydrogen gas is passed through and into the solution and the reaction that takes place is:
b) Calculate
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