What is SHE ? What is its application?
Answers
Answer:
SHE is tha basic guide for the reporting of the capacity of quantitative half -cells.It is a type of gas electrode and has been commonly used as a reference electrode and as an indicator electrode for calculating PH values din early studies. .
What is SHE?
The Standard Hydrogen Electrode is often abbreviated to SHE, and its standard electrode potential is declared to be 0 at a temperature of 298K. This is because it acts as a reference for comparison with any other electrode.
The redox half cell of SHE is where the following reaction takes place:
2H+ (aq) + 2e– → H2 (g)
The reaction given above generally takes place on a platinum electrode. The pressure of the hydrogen gas present in this half cell equals 1 bar.
Application :-
This is used to calculate the electrode potentials of various half cells.
Let us calculate the electrode potential of Zn half-cell. The apparatus is set as shown:
With reference to attachment.
We known Zinc is more reactive than hydrogen, that is it has more tendency to loose electrons. Therefore, the following reactions occur:
With reference to attachment.
Likewise, if we calculate it for Copper half cell it comes out to be = 0.34 volt .This fact gave rise electrochemical series
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