Van't Hoff

[Amal Aboumerhi 3E]

Hi! Could someone explain how we derive the Van't Hoff equation?

[Lizzie Su 1I]

To derive the equation, we use two expressions that are equivalent to the standard Gibbs free energy of a reaction (delta H - T*delta S and -RTlnK). If we set these equal to each other and solve for lnK, we have the Van't Hoff equation that shows us the temperature dependence of the equilibrium constnat.

[006263523]

There are two equations to find delta G, -RTlnK and deltaH-TdeltaS. Set these equal to each other and divide -RT from both sides. You get lnK=(-deltaH/RT)+(deltaS/R).