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An electrode of the second kind consists of a metal sheet coated with a layer of a slightly soluble salt of the metal of which it is made, immersed in an electrolytic solution: the last one must have the negatively charged ions in common with the slightly soluble salt . My question is: why are electrodes of this type called reversible with respect to the cation?

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    $\begingroup$ Presumably because the reaction involves precipitation or dissolution of the slightly soluble salt, which is a reversible process. $\endgroup$ – Buck Thorn May 14 at 8:13

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