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Reference Electrodes
The Saturated calomel electrode is a reference electrode based on the reaction between mercury and mercurous chloride. The aqueous phase in contact with the mercury and the mercurous chloride (Hg2Cl2, "calomel") is a saturated solution of potassium chloride in water.
The Calomel Electrode used in pH measurement, cyclic voltammetry and general aqueous electrochemistry. This electrode and the silver/silver chloride reference electrode work in the same way. In both electrodes, the activity of the metal ion is fixed by the solubility of the metal salt. The calomel electrode contains mercury, which poses much greater health hazards than the silver Chloride Electrode.

A silver chloride electrode is a type of reference electrode, commonly used in electrochemical measurements. For example, it is usually the internal reference electrode in pH meters. As another example, the silver chloride electrode is the most commonly used reference electrode for testing cathodic protection corrosion control systems in sea water environments. Silver chloride electrodes are also used by many applications of biological electrode systems (ECG) and (EEG)

Merury(I) sulfate, commonly called mercurous sulphate is the chemical compound Hg2SO4.[2]Mercurous sulfate. Metallic salt of sulfuric acid formed by replacing both hydrogen atoms with mercury(I). It is highly toxic; it could be fatal if inhaled, ingested, or absorbed by skin. This electrode commonly used in argentometric titrations to avoid chloride contamination.