calomel half cell

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A type of half cell in which the electrode is mercury coated with calomel (HgCl) and the electrolyte is a solution of potassium chloride and saturated calomel. The standard electrode potential is –0.2415 volt (25°C). In the calomel half cell the reactions are HgCl(s)⇌Hg+(aq)+Cl(aq)Hg+(aq)+e⇌Hg(s) The overall reaction is HgCl(s)+e⇌Hg(s)+Cl(aq) This is equivalent to a Cl2(g)|Cl(aq) half cell.



Subjects: Chemistry.

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