### Van't Hoff Equation

Posted:

**Fri Feb 22, 2019 12:34 pm**What is the purpose and concept behind the Van't Hoff Equation?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=136&t=42639

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Posted: **Fri Feb 22, 2019 12:34 pm**

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

Posted: **Fri Feb 22, 2019 12:43 pm**

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.

The equation is lnk=(-delta h/RT) + (delta S/R). The Detla H and S are both in standard state.

Posted: **Tue Feb 26, 2019 12:44 pm**

what do you mean calculate K at a different temperature ?

Posted: **Tue Feb 26, 2019 12:49 pm**

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.