By using the Ellingham diagram in Figure 17.9,(a) predict which metals will reduce FeO at 500 K,

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By using the Ellingham diagram in Figure 17.9,(a) predict...

By using the Ellingham diagram in Figure $17.9,(\mathrm{a})$ predict which metals will reduce $\mathrm{FeO}$ at $500 \mathrm{K},(\mathrm{b})$ estimate $\Delta G^{\circ}$ for the reaction between FeO and carbon at $1200 \mathrm{K},$ and (c) assess to what extent the reaction between $\mathrm{Sn}$ and $\mathrm{NiO}$ is affected by changing the temperature from 600 to $1000 \mathrm{K}$.

Key Concepts

Ellingham Diagram

An Ellingham diagram is a graphical representation that plots the standard free energy change (?G°) of formation reactions, typically metal oxides, as a function of temperature. It is used to compare the stability of compounds and to predict the feasibility of redox reactions, including which metals can reduce specific metal oxides. The position and slope of the lines help determine when one oxide will be reduced by a metal, especially when different reducing agents are involved.

Standard Free Energy (?G°)

Standard free energy change is a thermodynamic quantity that indicates whether a reaction is spontaneous under standard conditions. When ?G° is negative, the reaction can proceed spontaneously, while a positive value indicates non-spontaneity. By estimating ?G° at various temperatures, one can assess the driving force of a reaction and determine its feasibility in processes such as metal extraction or reduction reactions.

Redox Reaction Equilibria

Redox reaction equilibria involve the transfer of electrons between species, usually between a reducing agent and an oxidizing agent. The analysis of these reactions requires evaluating the relative free energies to determine which species will lose electrons (oxidize) and which will gain electrons (reduce). The Ellingham diagram is a standard tool in this context, providing insights into the balance of oxidizing and reducing tendencies based on their free energy profiles.

Temperature Dependence of Reaction Spontaneity

Temperature has a crucial influence on reaction spontaneity, as reflected by the slopes in an Ellingham diagram. As temperature changes, the standard free energy values of reactions also change, which can shift the balance between reactants and products. Understanding this dependence is essential in predicting how variable temperatures affect the course of metal reduction reactions and the overall feasibility of processes in high-temperature metallurgy.

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