## Van't Hoff Equation

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

Emily Ng_4C
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Van't Hoff Equation

What is the purpose and concept behind the Van't Hoff Equation?

Giselle1B
Posts: 26
Joined: Fri Sep 28, 2018 12:19 am

### Re: Van't Hoff Equation

According to Lavelle's lecture the Van't Hoff equation "can be used to calculate k [equilibrium] at a different temperature if delta H is known."
The equation is lnk=(-delta h/RT) + (delta S/R). The Detla H and S are both in standard state.

hanna_maillard3B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Re: Van't Hoff Equation

what do you mean calculate K at a different temperature ?

Emma Scholes 1L
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am

### Re: Van't Hoff Equation

K varies by temperature, so the Van Hoff equation is used to calculate K at a different temperature. If you know delta H and the K value at one temperature, you can use the equation to find K at a different temperature.