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Calomel Electrode

A calomel electrode can be used instead of a standard hydrogen half cell as a reference electrode. It consists of mercury in contact with a saturated solution of mercury (I) chloride. The calomel electrode has a standard electrode potential of +0.27V.

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Specification: OCR Chemistry A (H432), A-level, 5.2.3 Redox and electrode potentials. Topic: Electrochemistry.

Key terms in this lesson

standard hydrogen electrode
A reference half cell, assigned an electrode potential of 0.0V by definition, consisting of hydrogen gas at 100kPa bubbled over a platinum electrode in a solution of H+ ions at 1moldm-3.

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