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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
Calomel is used as the interface between metallic mercury...
- Mercury(I) chloride
Mercury (I) chloride is the chemical compound with the...
- Calomel
Calomel is used as the interface between metallic mercury and a chloride solution in a saturated calomel electrode, which is used in electrochemistry to measure pH and electrical potentials in solutions. In most electrochemical measurements, it is necessary to keep one of the electrodes in an electrochemical cell at a constant potential.
A reference electrode is an electrode that has a stable and well-known electrode potential. The overall chemical reaction taking place in a cell is made up of two independent half-reactions, which describe chemical changes at the two electrodes.
A glass electrode is a type of ion-selective electrode made of a doped glass membrane that is sensitive to a specific ion. The most common application of ion-selective glass electrodes is for the measurement of pH. The pH electrode is an example of a glass electrode that is sensitive to hydrogen ions.
Mercury (I) chloride is the chemical compound with the formula Hg 2 Cl 2. Also known as the mineral calomel [4] (a rare mineral) or mercurous chloride, this dense white or yellowish-white, odorless solid is the principal example of a mercury (I) compound. It is a component of reference electrodes in electrochemistry.
Eine Kalomelelektrode besteht aus Quecksilber, welches mit schwerlöslichem Kalomel (Hg 2 Cl 2) überzogen ist und in eine gesättigte Kaliumchlorid -Lösung taucht. Mit der Analysenlösung kann Kontakt über ein Diaphragma ( semipermeable Membran) oder einen Flüssigkeitsfilm im Schliffstopfen hergestellt werden.
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What is a saturated calomel electrode?
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Which electrode is better calomel or silver chloride?
How do calomel electrodes work?
A silver chloride electrode is a type of reference electrode, commonly used in electrochemical measurements. For environmental reasons it has widely replaced the saturated calomel electrode. For example, it is usually the internal reference electrode in pH meters and it is often used as reference in reduction potential measurements.
