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REFERENCE ELECTRODE

Calomel electrode; Calomel half-cellar; Calomel reference electrode

calomel

n. καλομέλανο, υποχλωριούχος υδράργυρος

تعريف

Calomel

·noun Mild chloride of mercury, Hg₂Cl₂, a heavy, white or yellowish white substance, insoluble and tasteless, much used in medicine as a mercurial and purgative; mercurous chloride. It occurs native as the mineral horn quicksilver.

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ويكيبيديا

Saturated calomel electrode

The saturated calomel electrode (SCE) is a reference electrode based on the reaction between elemental mercury and mercury(I) chloride. It has been widely replaced by the silver chloride electrode, however the calomel electrode has a reputation of being more robust. The aqueous phase in contact with the mercury and the mercury(I) chloride (Hg₂Cl₂, "calomel") is a saturated solution of potassium chloride in water. The electrode is normally linked via a porous frit to the solution in which the other electrode is immersed. This porous frit is a salt bridge.

In cell notation the electrode is written as:

{\ce {{Cl^{-}}(4M)|{Hg2Cl2(s)}|{Hg(l)}|Pt}}

https://en.wikipedia.org/wiki/Saturated calomel electrode