What is standard hydrogen electrode? Why is it preferred as primary reference electrode? Also discuss its limitations.

The Standard Hydrogen Electrode (SHE) is a fundamental reference electrode used in electrochemistry to measure the standard electrode potential of other half-cells and to establish a reference point for the electrochemical potential of hydrogen ions (H+) in aqueous solutions. It is considered the primary reference electrode due to its well-defined and stable electrochemical properties.

Here's why the Standard Hydrogen Electrode is preferred as a primary reference electrode:

1. Well-Defined Electrode Potential: The SHE has a precisely defined electrode potential of 0 volts at all temperatures, making it an _____ ________ ________ ____ ___ __________ _____ ______ ____ _______ ______ _____.
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