Question 6 of 8 Map sapling earning Why can a silver electrode be used as an ind

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Question 6 of 8 Map sapling earning Why can a silver electrode be used as an indicator electrode for Ag and halides? The silver electrode contains two membranes. One membrane contains a substance that reacts with O Ag and halides to form an ionic silver-halide complex. The potential difference created at the second, ion-selective membrane changes as the [silver-halide complex changes Because Ag and halides equilibrate with ion-exchange sites at the outer surface of the ion-selectiv O membrane. Diffusion of Ag and halides out of the membrane creates a charge imbalance or potential difference. Changes in [Ag and [halides] alter the magnitude of the potential difference Because the reaction at the silver electrode involves the Ag IAg couple, changes in the [Agt] effect the potential at the electrode. Halides react with Ag to form solid silver halides. At equilibrium, the [Ag equals sp so changes in the [halidel effect the potential at the electrode The reaction at the silver electrode forms a silver-halide complex. Formation of the silver halide C complex reduces the amount of metallic silver in the electrode. Changes in the mass of the silver electrode alter the potential measured at the electrode Previous Give Up & View Solution Check Answer Next Exit Hint The silver electrode is an example of a metal electrode

Explanation / Answer

The third option is correct.

As the couple is Ag+/Ag which in presence of Chloride and silver ions forms the insoluble salt AgCl. thus the concentration of Ag+ will be Ksp/[Cl-] which depends on chloride ion concenration and the potential value depends reversibly on chloride ion concentration.

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