Give the chemical composition of calomel electrode.
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Calomel is made up of mercury and chlorine with the chemical formula Hg2Cl2.
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The aqueous phase in contact with the mercury and the mercury (I) chloride (Hg2CI2,"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.
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