Consider the concentration cell in Fig. 18.10. If the Fe^2+ concentration in the right compartme

step 1 So let's first draw the concentration cell that was given to us in figure 1710. And we see a .01

Consider the concentration cell in Fig. 18.10. If the Fe^2+...

Consider the concentration cell in Fig. $18.10$. If the $\mathrm{Fe}^{2+}$ concentration in the right compartment is changed from $0.1 M$ to $1 \times 10^{-7} M \mathrm{Fe}^{2+}$, predict the direction of electron flow, and designate the anode and cathode compartments.

Key Concepts

Concentration Cell

A concentration cell is a type of galvanic cell in which the electrodes are identical, and the cell potential arises solely from a difference in ion concentrations between the two half-cells. This potential difference drives the spontaneous electron flow when the cell is closed in an external circuit.

Redox Reactions

In any electrochemical cell, redox reactions occur at the electrodes. Oxidation (loss of electrons) takes place at the anode, while reduction (gain of electrons) occurs at the cathode. Understanding these processes is crucial to predict the direction of electron flow and to designate the electrodes correctly.

Nernst Equation

The Nernst equation relates the electrode potential to the concentration (or activity) of the reacting ions in solution. In concentration cells, it quantifies how differences in ion concentrations lead to a potential difference between otherwise identical electrodes, ultimately determining the cell's electromotive force.

Electrode Polarity and Electron Flow

Electrode polarity in electrochemical cells is determined by the direction of the redox reactions: the electrode where oxidation occurs is the anode and the one where reduction takes place is the cathode. In concentration cells, the electrode immersed in the lower concentration solution usually becomes the anode (oxidation), while the one in the higher concentration solution becomes the cathode (reduction), setting the direction of electron flow from anode to cathode.

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