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Difference between primary and secondary reference electrode
Accepted Answer
Primary and secondary reference electrodes differ in their construction and use. Primary reference electrodes (such as the standard hydrogen electrode) are used to define the absolute potential of an electrochemical cell, and they are highly reproducible and stable. Secondary reference electrodes (such as the calomel electrode or silver/silver chloride electrode) are used as practical references in electrochemical measurements, and they are typically more convenient to use than primary reference electrodes. However, they are not as reproducible or stable as primary reference electrodes, and their potential may vary slightly depending on the conditions of the measurement.
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