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An Ellingham diagram provides information about: (1) the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals. (2) the kinetics of the reduction process. (3) the temperature dependence of the standard Gibbs energies of formation of some metal oxides. (4) the conditions of pH and potential under which a species is thermodynamically stable.

1. the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.
2. the kinetics of the reduction process.
3. the temperature dependence of the standard Gibbs energies of formation of some metal oxides.
4. the conditions of pH and potential under which a species is thermodynamically stable.

Correct answer: the temperature dependence of the standard Gibbs energies of formation of some metal oxides.

Solution

An Ellingham diagram plots the standard Gibbs energy of formation of metal oxides versus temperature, showing its temperature dependence. (The pH/potential stability description is a Pourbaix diagram.)

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