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Which of the following salt bridge solutions must be used for silver/silver chloride electrode?

(a) Saturated KCl

(b) Saturated K2SO4

(c) Saturated LiCl

(d) Saturated KNO3

This question was posed to me in an interview.

This intriguing question comes from Secondary Reference Electrodes in chapter pH Meters and Ion Analysers of Analytical Instrumentation

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Correct choice is (a) Saturated KCl

The best explanation: Saturated KCl is used as the salt bridge solution for silver/silver chloride electrode. It can also be used for calomel electrode.

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