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What (who) is calomel$10790$ - definition
REFERENCE ELECTRODE
Calomel electrode; Calomel half-cellar; Calomel reference electrode
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.
Calomel
![Label from a calomel and [[cinnabar]] specimen](https://commons.wikimedia.org/wiki/Special:FilePath/Calomel-bem-10c.jpg?width=200 "Label from a calomel and [[cinnabar]] specimen")
MINERAL FORM OF THE MERCURY(I) CHLORIDE
Sweet mercury
·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.
calomel
MINERAL FORM OF THE MERCURY(I) CHLORIDE
Sweet mercury
n.
Chloride of mercury, protochloride of mercury, subchloride of mercury, mercurous chloride.
Wikipedia
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:
