## 2 Forms

$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$

Jesse_torres2H
Posts: 41
Joined: Thu Jul 27, 2017 3:00 am

### 2 Forms

What are the two different variations of the Van't Hoff Equation and when do we use each one?

Michelle Dong 1F
Posts: 110
Joined: Fri Sep 29, 2017 7:04 am

### Re: 2 Forms

The two different forms of Van't Hoff are just based on what the question is asking you; usually we use the second one (lnK2/K1 = -deltaH/R(1/T2-1/T1)) to determine if an increase in temperature for a reaction will cause the reaction to form more products or reactants based on whether it is endothermic or exothermic (K2 and K1 are for the same exact reaction just at different temperatures). If K2>K1, the reaction will form more product. The normal Van't Hoff equation is to show that the equilibrium constant is dependent on temperature (when temperature increases, the equilibrium constant increases).