A electrolytic cell operating under standard conditions (1.0 M ion concentration

Question

A electrolytic cell operating under standard conditions (1.0 M ion concentrations) utilizes the following reaction:

What is the effect on the cell emf of each of the following changes?




(a) Water is added to the cathode compartment, diluting the solution.
The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero. The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.

(b) The size of the silver electrode is increased.

The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.    The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.

(c) A solution of 1.0 M CrCl3 is added to the cathode compartment.
The positive cell emf rises, becoming more positive.The positive cell emf drops closer to zero.    The negative cell emf rises closer to zero.The negative cell emf drops, becoming more negative.No change in cell emf occurs.

Explanation / Answer

For the given electrolytic cell,

The effect on the cell emf by the following changes would be,

(a) When weater is added to the cathode compartment, it makes the solution more dilute.

The positive cell emf drops closer to zero.

(b) When the size of silver electrode is increased, more surface area for the reaction is available,

The negative cell emf rises closer to zero.

(c) When a solution of 1 M CrCl3 is added to cathode compartment, higher cncentration of Cr3+ is available,

The postive cell emf rises.

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