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General Chemistry

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Moderate

Effect of $KCl$ on $Ni/Ag$ Cell

CHEM-JUSV9F

Consider the cell below:

$$\textrm{Ni}|\textrm{Ni}^{2+}||\textrm{Ag}^{+}|\textrm{Ag}$$

How would the cell potential change with the addition of $\textrm{KCl}$ to both cell compartments? Select the BEST answer.

A

Increase. $\textrm{KCl}$ is a salt and upon dissolution would improve the conductivity of the solution, thereby increasing the cell potential.

B

Increase. The chloride ion in the cathode compartment would precipitate $\textrm{AgCl}$, reducing the concentration of $\textrm{Ag}^+$, thereby increasing the potential.

C

No Change. $\textrm{KCl}$ is an inert substance; no change to potential would occur.

D

No Change. The chloride ion would precipitate with the $\textrm{Ag}^+$ and $\textrm{Ni}^{2+}$ ions. Because this process occurs in both cells, the effect is canceled out.

E

Decrease. The chloride ion in the cathode compartment would precipitate $\textrm{AgCl}$, reducing the concentration of $\textrm{Ag}^+$, thereby decreasing the potential.

F

Decrease. $\textrm{KCl}$ is a salt and upon dissolution would improve the conductivity of the solution, thereby decreasing the cell potential.