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Metallic indicator electrodes of the third kind respond to certain cations of other metals in solution. Explain how a mercury

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Metal electrode of third kind is an assembly consists of a metal in contact with two slightly soluble salts (one containing the cation of the solid metal, the other the cation to be determined, with both salts having a common anion) immersed in a solution containing a salt of the second metal (e.g., zinc metal--zinc oxalate, calcium oxalate--calcium salt solution).

HgY2- + 2e- ↔ Hg(l) + Y4-

CaY2- ↔ Ca2+ + Y4-

Y can be any common anion in both the salts. The Calcium ion released depends on the reaction shown above. Greater the relase of calcium ion, activity of increases.

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