The cell EMF and chemical potential of the overall cell reaction

This section is a reworking of the important point that was dealt with for nonaqueous systems in Sect. 10.3. Here the same topic is addressed from a different direction using a typical reaction in an aqueous electrochemical cell. The objective is to demonstrate that the cell EMF is directly related to the chemical potential difference of the overall cell reaction by an equation analogous to Eq (10.5a). To this end, the cell described below us utilized.

Figure 10.5 depicts a special kind of type-1(c) cell with two metal electrodes immersed in water and different ionic species in each compartment. The cell operates in the equilibrium mode with a potentiometer measuring the voltage difference between the two electrodes. In the left hand compartment, the electrode is a metal M and the solution contains ions of the metal Mz+. Positively-charged ions are called cations. There must also be negative ions in solution (called anions) to maintain electrical neutrality, but these are ignored because they do not participate in the electrochemical reactions.

electrode, metal M

Figure 10.5 depicts a special kind of type-1(c) cell with two metal electrodes immersed in water and different ionic species in each compartment. The cell operates in the equilibrium mode with a potentiometer measuring the voltage difference between the two electrodes. In the left hand compartment, the electrode is a metal M and the solution contains ions of the metal Mz+. Positively-charged ions are called cations. There must also be negative ions in solution (called anions) to maintain electrical neutrality, but these are ignored because they do not participate in the electrochemical reactions.

<3-i electrode, metal M

bridge inert metal electrode bridge inert metal electrode

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Solar Panel Basics

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