How does temperature affect the extent of reaction?
Temperature dependence of the equilibrium constant (also the free energy) can be derived by assuming that the enthalpy and entropy are not temperature dependent. With this assumption we can compare two equations:
and
By combining these equations we obtain an epression for the temperature dpeendence of the equilibrium constant. It is known as the van't Hoff relation. The van't Hoff relation is extremely useful since it gprovides a connection between empirical;y measured equilibrium data and thermodynamic parameters. Onc can measure K at a variety of tempearatures and then plot ln(K) vs. 1/T to obtain both the enthalpy and entropy of a process. The van't Hoff relation and its applications are described in the following video.
